Monday 24 January 2022

PB 19 at Middle Bay

I am in search for any traces of PB 19 at the northern end of Middle Bay. I go down some old steps beside No. 20 South Bay Road  leading  to a rocky beach some 30 metres north of the shark nets at Middle Bay.  On the way down I go past a number of WW2 type concrete stanchions for  anchoring down the barbed wire. PBs normally had a barbed wire perimeter around them and this indicated that I was on the right track.

Concrete stanchion for barbed wire fencing

Concrete stanchion and gate post

No. 20 is a new-build and even the previous building had engulfed the PB into the seaward-wall. The marked photo below shows No. 20 and the approximate position of the PB which is probably still intact but swallowed by the wall.  Rob Weir's records suggested that the LL structure was to to the right (south-east) and slightly up the hillside. Here I found what looked like military grade reinforced concrete that might have been the base of the LL. 

Position of PB 19 at Middle Bay

Reinforced concrete could this have been the base of the LL structure

This PB was part of 'C' Coy 1/Mx under Major Marsh whose Coy HQ was at Shouson Hill. The PB commander was Sgt Manning. PB 19 had engaged Japanese troops on Middle Spur and Violet Hill on 21 December. On the night of 22 December PBS, 16,17, 18, 19, 20 were ordered to evacuate their PBs and withdraw through Japanese patrols  to Stanley. by way of Stanley View.  At one stage, prior to the evacuation  PB 19 fired on PB 17 at Repulse Bay to clear Japanese troops from the roof of the PB.


Sunday 23 January 2022

Beach Defence Unit (PB 24 and LL 24)

PB 24 at St Stephen's Beach was demolished in the late 1990s. Only the Lyon Light structure (LL 24) remains. It is located on the hillside just above the right-hand building in the photograph. The photo shows the Sea Cadet compound surrounded by a wire fence. Rob Weir recalls the PB was located below and to the left of the LL structure and closer to the shoreline. To get to the LL you have to work your way around the perimeter fence and then go up the hill behind the right-most building looking out for a modern water tank erected beside the LL structure.

The Sea Cadet compound at St Stephen's Beach (Writer's collection)

The roof of the LL structure showing some of the stone cladding used as camouflage 
 (Writer's collection)

Inside the LL structure there is quite a lot of junk and signs that it may have been used in the past as a dwelling. As I made my way along the perimeter of the Sea Cadet compound I saw a man fishing from the rocks. He asked where I was going and I explained what I was looking for.  On my return he asked to see the photos I had taken of the military structure. He thought it might have been the one he lived in more than fifteen years ago. He now lives in the Ma Hang public housing estate. There were signs of squatters huts near the LL structure. 

The searchlight aperture has been bricked up in the middle leaving two windows on either side as seen  below. The photo also shows a pipe in the wall on middle right. At first I thought it may have been the exhaust pipe for the engine that powered the searchlight. However, Rob Weir advised that the engine was on a shelf at the rear of the structure and the exhaust outlet was built into the back wall. This protruding pipe may have been the voice pipe for communicating with the PB. Some other LL structures show a similar feature. 

The front of the structure was semi-circular in construction. When the searchlight was not in use the aperture would be closed by steel shutters. The steel entry door and steel shutters are missing and no doubt illegally sold to scrap merchants after the war. 

Inside the LL structure - the aperture has been partly bricked up. (Writer's Collection)

Beside the entrance doorway was this metal pole shown in the photo below. It looks like a water pipe but it is in fact part of the frame of the retractable bunk. These bunk frames can be seen at Jardines Lookout PB 3 ......but are best seen at PB 21 on Chung Hom Kok Beach.

The Lyon Light had a crew of two men. The LL was normally above the PB sometimes situated on a tower (like PB 32) or on the roof like PB 33 (A) or on the hillside above like this one. The LL  if not on the roof was normally 10 to 40 metres away from the PB.

Part of the frame of a retractable bunk. (Writer's collection)

The photo below shows retractable bunk frames in situ at Chung Hom Kok (PB 21). The canvas between the frame has long since disintegrated. Most of the PBs could sleep nine men with two more bunks for the crew in the LL structure. 

The frames for a retractable bunks in PB 21. (Writer's collection)

The LL contained the 2ft diameter searchlight and the petrol generator for powering the searchlight. The generator may have looked like the one in the photo below.

1940's Briggs & Stratton generator (Source:

Entrance with steel door removed - the tiles suggest use as a dwelling (Writer's collection)

The PB was commanded by Sgt William Stone, 1/Mx 'B' Coy. He was wounded during evacuation of the PB and the nearby Prep School on 25 December.  'B' Coy included PBs 21 (Chung Hom Kok Beach) to PB 30 (Turtle Cove). The company was commanded by Captain Martin Weedon whose Coy HQ was originally at Stone Hill Shelters. The Coy HQ  which is still extant was later moved to St Stephen's College Prep School. Stone Hill Shelters was then used briefly as East Brigade HQ after the troops in the eastern sector of the Island had withdrawn to the Stanley Perimeter.

The PB was in action on the morning of 25 December when Japanese troops infiltrated, in the early hours,  along the coastline to St Stephen's Beach and occupied the copse at the back of the beach. They were driven off by members of the Middlesex Detachment ('B' and 'D' Coy), based at the Prep School, and by PB 24 which opened fire on Japanese troops on the beach all of whom were killed or driven back. This was a PB that saw action - thankfully, although in poor condition, the LL structure still survives the ravages of time and neglect.



1/Mx War Diary WO 172/1689 

Rob Weir for information on Lyon Lights and fixed defences


View from the roof of the LL structure

Saturday 22 January 2022

Pte Donald MacDonald - 'A' Coy 2nd Battalion Royal Scots - Battle for Hong Kong

Donald Walker MacDonald was born 6 July 1922 in Glasgow. He joined the Army as a boy soldier aged fifteen. In 1938, at the age of sixteen, he was sent out to Hong Kong where he served with the 2nd Battalion Royal Scots. The battalion had arrived in Hong Kong in January 1938 from India. I do not have a record of which company (Coy) he served in, but in 1975, he recalled in a press interview that he was based at the Shing Mun Redoubt. So we can assume he was with 'A' Coy commanded by Captain Cyril Jones.

'A' Coy consisted of three platoons, one of which was located in the redoubt, and the other two platoons were close to the redoubt. The Coy HQ was situated in an Artillery Observation Post (AOP) at the back of the redoubt. 

Pte Donald MacDonald wearing the Royal Scots Glengarry - 

When the Battle for Hong Kong began in December 1941, the Royal Scots were positioned on the left flank of the Gin Drinkers Line (GDL). The GDL was a ten-mile defensive line that ran across the Kowloon Peninsula from east to west. The line consisted of some ninety pillboxes, minefields, slit trenches and concertina barbed wire anchored by steel pickets known as Dannert wire. 

The Gin Drinkers Line

The Royal Scots positions on the GDL extended from Gin Drinkers Bay along a low line of hills referred to as Pineapple Ridge. 'C' Coy were on the left flank, on a headland known as the Texaco Peninsula because of a Texaco port and oil storage facility.  'B' Coy was in the centre of the Royal Scots sector of the line. 'A' Coy were on the right flank of the line including Shing Mun Road, Pineapple Dam and the Shing Mun Redoubt. The redoubt was a strongpoint consisting of a series of concrete tunnels linking five pillboxes and several open-air concrete firing bays. The AOP where Captain Jones had established his HQ was co-occupied by Lt Wilcox, Royal Artillery, and four gunners. It was their job to observe and direct artillery fire from the howitzers positioned behind the line.  

Map showing C, B, A and D Coy initial positions and subsequent positions  C2, B2, A2 and D2

We can be sure that MacDonald was a member of 'A' Coy because he stated that he was at the Shing Mun Redoubt. This I take to mean, as at or near the Shing Mun Redoubt. However, we don't know which of three platoons in 'A' Coy (No. 7, No. 8 and No. 9) he was serving with. 

No. 7 and No. 9 Platoons were located around Shing Mun Road leading to Pineapple Dam and the Shing Mun Redoubt.  No. 8 Platoon (the Shing Mun Platoon) commanded by 2/Lt Thomson was based at the redoubt and was responsible for the defence of the strongpoint. The Shing Mun Platoon (No. 8 Platoon) consisting of 26 other ranks was insufficient a force to man a complex of this size and at the same time carry out moving and static patrols. However, inadequate manning was a feature throughout the GDL and throughout the Battle for Hong Kong. Hong Kong had become an isolated outpost, a strategic liability. Churchill recognised this when he wrote to his military adviser, regarding a request for reinforcements, and commented that there was not the slightest chance of holding or relieving Hong Kong if it were attacked. The priority for men and equipment in the Far East was Malaya and Singapore. Singapore was the impregnable fortress and Hong Kong would be sacrificed but not without a fight.

A Royal Scots officer on the Gin Drinkers Line

The redoubt was captured during the night of Tuesday 9 December. It was the second night of the battle. It was captured by Colonel Doi's 228th Infantry Regiment consisting of three battalions each consisting of approximately 1,000 men. The AOP was blown open, two Indian other ranks serving with the Royal Artillery were killed. The surviving  gunners and 'A' Coy HQ personnel were taken prisoner.  One of the pillboxes was hit by British artillery fire and the four Royal Scots holding the PB were dug out by the Japanese and became Prisoners of War. Sgt Robb, the Shing Mun Platoon Sergeant, conducted a firefight in which five of the platoon were wounded and left behind. Of the five, one made it back to British lines and one was killed. The remaining three were taken prisoner. We know that MacDonald was not captured at the Redoubt as he stated in correspondence that he was taken prisoner  when the crown colony capitulated on Christmas Day 1941 at which time he was injured and in hospital. 

Sgt Robb found himself both outnumbered and under fire from different directions. He estimated there were two hundred Japanese (roughly two companies) attacking the redoubt. Robb then extricated with around a dozen men, leaving the five wounded men behind. He withdrew along Smugglers Ridge to link up with 'D' Coy Rajputs commanded by Captain Newton. The names of the men in Sgt Robb's party that reached the Rajput positions are recorded in the battalion war diary. 

Sgt Robb
L/Sgt Corbett
L/Cpl Gray
L/Cpl Ralph
L/Cpl Wallace
Pte Gullane
Pte O'Rawe
Pte Stevenson
Pte Archibald
Pte Scott
Pte Still
Pte Wood

Assuming this is  a complete list, and since Pte Donald MacDonald is not on the list then we can  assume that he was most likely a member of either No. 7 or No. 9 Platoon. After the loss of the redoubt, 'D' Coy moved up to Golden Hill and 'B' and 'C' Coy were moved back to a new line extending south east from Golden Hill towards Lai Chi Kok. 'C' Coy were to the rear of 'D' Coy (see position C2 on the above map). 'B' Coy was to the rear of 'C' with their left flank astride Castle Peak Road and their right flank extending to the ridge line (see B2). No. 9 Platoon of 'A' Coy were deployed to support the left flank of Captain Newton's company. The rest of 'A' Coy (No. 7 Platoon and the survivors of No.  8 Platoon were taken by truck to new positions on the Castle Peak Road (See A2 on map). I think it is likely that Pte MacDonald was part of this group and more specifically a member of No. 7 Platoon. 

The evacuation of the Mainland began on the night of 11 December. The Royal Scots were evacuated from Kowloon City to HK Island. No. 9 Platoon under Sgt Richards, which had been deployed with Captain Newton's 'D' Coy Rajputs were evacuated from Devil's Peak Peninsula. Sgt Richards and Pte Chorley, after coming under fire,  got separated from both the main body 'D' Coy Rajputs and the rest of their platoon. They were helped by Chinese villagers who supplied them with Chinese clothes. They took a small boat but the current took them away from Hong Kong Island and they ended up getting washed up on an uninhabited island next to Waglan Island. The lighthouse on Waglan Island had already been evacuated.  After several days without food and water they were picked up by Chinese fishermen and eventually landed on Hong Kong Island (the Island). They rejoined the battalion on 20 December. Part of the remainder of No. 9 Platoon who scattered during the ambush also took a boat and rowed towards the Island. They were picked up by a British patrol boat who brought them back to HK Island. This party of five members of 'A' Coy and two members of 'HQ' Coy were identified in the battalion war diary.

L/Cpl Phillips, HQ Coy
Bd Cooper, HQ Coy
Cpl Brown, 'A' Coy
Cpl Pennman, 'A' Coy
L/Cpl McVean, 'A' Coy
Pte Ritchie, 'A' Coy
Pte Robertson, 'A' Coy

The brunt of the fighting on the Mainland was in the Royal Scot's sector and they incurred a large number of casualties including the company commanders of 'B' and 'C' Coy who were both killed in action. After the evacuation of British troops from the Mainland, the Island came under siege with heavy artillery bombardment and aerial bombing as a prelude to the Japanese landings. The Japanese landed at three locations on the north east shore of the Island during the night of Thursday 18 December. It is estimated that some 8,000 troops were landed between North Point, Tai Koo and Aldrich Bay. The defenders on this stretch of the shoreline consisted of three Rajput companies, a Canadian infantry company at Lai Mun Gap, a special guard unit of Volunteers at the North Point power station and assorted artillery personnel from coastal defence, howitzer and anti-aircraft batteries. They amounted to less than 800 men. The defenders were outnumbered ten to one.  The Rajput battalion was decimated and the Japanese army moved inland and converged on Wong Nai Chung (WNC) Gap from different directions. The following morning the Japanese seized WNC Gap and Brigadier Lawson, commanding West Infantry Brigade, was surrounded at his Brigade HQ  at Wong Nai Chung Gap.

On Friday 19 December at 0710, Captain Kenneth Campbell, the newly appointed commander of 'A' Coy, (Captain Jones having been captured) received orders from Battalion HQ at Wan Chai Gap to relieve West Brigade HQ, and extricate Brigadier Lawson and his staff. He had earlier reported that his HQ had been surrounded by Japanese troops and was coming under fire. Major-General Maltby, the military commander, called Lt-Col Simon White, 2/RS, the battalion commander, to stress the importance of 'A' Coy's mission. Lt-Col Simon White told Major-General Maltby that 'A' Coy would go like the 'hammers of hell'. Pte Donald MacDonald, as a member of 'A' Coy, may well have been involved in this operation.

Lt-Col Simon White (Courtesy: Royal Scots Regimental Museum)

'A' Coy were deployed by truck to the petrol station at the there-way junction of Tai Hang Road, Stubbs Road  and WNC Gap Road.  'A' Coy came under heavy fire from the western slopes of Jardines Lookout as they tried to make their way up WNC Gap Road (No. 8 Platoon) and Blue Pool Road (No. 7 Platoon) towards West Brigade HQ. At 0815, the Royal Scots Battalion HQ, were advised by Lt-Col Sutcliffe, the commanding officer of the Winnipeg Grenadiers, that Brigadier Lawson had reported that there was no sign of 'A' Coy. 2/Lt Swettenhan, a newly commissioned officer in the Royal Scots promoted from the Volunteers, offered to take out a small patrol to link up with 'A' Coy and report back to Bn HQ. Swettenham and three other ranks departed Wan Chai Gap by car at 0900 hours. They got close to Brigade shelters and noticed that vehicles in the Brigade HQ car park were on fire. In the afternoon a runner from 'A' Coy reported back to Bn HQ that they had got to within 200 metres of West Brigade HQ shelters, but they had been pinned down by heavy fire. They had sustained heavy casualties which included both platoon commanders. 2/Lt Fenwick had been killed and 2/Lt Hart had been wounded. The Coy commander, Captain Campbell, later became a casualty. Sgt Whippey took over as company commander of the depleted 'A' Coy who had fought so gallantly all day.  When it became clear that no further advance could be made - Sgt Whippey ordered a withdrawal back to Bn HQ which had now moved to the junction of Tai Hang Road and Stubbs Road near the petrol station. As it happened the Brigadier had left his HQ at around 1000 hours and had been shot in the leg and had bled to death in the road outside his HQ. Some of the Royal Scots from 'A' Coy had managed to fight their way to Brigade HQ but they were all wounded and became trapped in the brigade shelters. These included the four NCOs listed below:  

Sgt Arnott
Sgt Corbett
Cpl Campbell
Cpl Glover

Those Royal Scots that reached West Brigade HQ were not seen alive again. Canadian Thomas Barton, a staff seargent in the Corps of Military Staff Clerks, recalled two Royal Scots getting through to Brigade shelters each with an arm almost severed. 'A' Coy had been reduced from seventy-six other ranks to an effective strength of just fifteen men. When the colony surrendered on Christmas Day the Royal Scots had an effective strength of only four officers and 109 other ranks. The rest were dead or wounded. 

Donald MacDonald was taken ill with appendicitis and when the surrender came he was in hospital recovering from an appendectomy. The operation was carried out by Surgeon-Lt Commander John Page, RN, most likely at the Royal Naval Hospital  in Wan Chai. After release from hospital MacDonald was incarcerated at Sham Shui Po POW Camp. At Sham Shui Po he took part in work parties sent to Kai Tak airfield to extend the airport and construct two new concrete runways to  replace what  had previously been a grass airfield.

In September 1942, aged twenty, he was included in a draft of POWs sent to Japan to work as slave labourers. He boarded the Lisbon Maru, an armed Japanese freighter, which was carrying some 1,800 British POWs. The freighter was sunk by an American submarine not realising the vessel was carrying POWs. The ship sunk slowly. The Japanese soldiers onboard were disembarked and transferred to other vessels leaving a skeleton crew and a handful of guards. The prisoners had been confined to the holds which had been battened down. The Japanese were planning to let the POWs go down with the ship. However, one of the prisoners had somehow smuggled a butcher's knife aboard the vessel. The prisoners were able to cut their way out, they overcame the guards and freed the POWs in the other holds. The ship was listing heavily and in danger of sinking. It was only after Chinese fishermen started picking up POWS that the Japanese stopped machine-gunning survivors and started to pick them up. MacDonald recalled  swimming to one of the Japanese launches and trying to scramble aboard. He was kicked away. He then swam round the other side of the vessel and a British officer helped pull him aboard. The survivors were collected and put ashore in Shanghai.  There had been 1, 816 POWS  aboard the vessel but on that cold Shanghai dock only 970 answered the roll-call, one of whom was Donald MacDonald. The survivors were put aboard another ship, the Shinsei Maru. The conditions were appalling. The ship was filthy and the POWs were once again placed in tiered bunks in the overcrowded holds. The POWs had lost what little possessions the had. They had virtually no cloths other than what they were wearing when they were plucked from the sea. MacDonald was  interned at a prisoner of war camp in Kobe, Japan.  where he remained until he was liberated aged twenty-three  in August 1945.

In 1975, Donald MacDonald, returned to Hong Kong with his wife Elizabeth. He described his return  to Hong Kong as a sort of pilgrimage. As a young man, he had fought in a battle, he had witnessed the horrors of war, the huge loss of life on the Lisbon Maru and the brutality of the prison camps in Hong Kong and Japan. After liberation in August 1945, MacDonald, aged twenty-three, returned home to Glasgow. He had come through it all, everything that fate had thrown his way, and he had survived.  This post is a tribute to a brave soldier



John C.G. MacDonald for information and photographs in respect of his grandfather (Donald MacDonald).

Royal Scots Regimental Museum  for photograph of Lt-Col Simon White

Tuesday 18 January 2022

Line of Gap Pillbox No. 16 (LPB 16)

Also known as Kennedy Town Gap PB.  A three-loophole PB situated on the hillside above Pofulam Road near Queen Mary Hospital. It has been occupied as a dwelling.  The building is well cared for and the area around the PB has been gardened. The steel loophole shutters look in very good condition. I could not see the commanders observation tower and ventilation shaft (presumably demolished). I was unable to go inside  or stay too long as I felt I was intruding on somebody's home. 

PB 16 - now used as a dwelling (Writer's collection)

Steel shutters and latch in good condition. Some pebble cladding extant. (Writer's collection)

Line of Gap Pillbox No. 18 (LPB 18)


LPB 18 is also referred to as Kennedy Town Gap PB 1. It was one of three line of gap pillboxes (LPB 16, 17, 18) situated in and around the gap between Mount Davis and High West. Pok Fu Lam Road runs through the gap. The PB is situated on the north eastern slopes of Mount Davis at the rear of the Chiu Yuen Cemetery. PB 17 has been demolished. PB 16 is used as a dwelling house.

A four loophole PB (Writer's collection)

Entrance door (Writer's collection) 

MG support platforms installed by Japanese  (larger than those for Vickers MG) (Writer's collection)

Possibly the blocked entrance to a Japanese tunnel (Writer's collection)

Condition:  The stone/pebble cladding remains over parts of the outside of the PB. The rock rampart is partly intact.  It has a large gun chamber accommodating four loopholes. The Japanese extended the MG mountings. There is what may be a Japanese tunnel. The Japanese must have put this PBB to use.  the loophole shutters look in good condition. The commanders observation tower is cracked on the outside. There are also cracks in the concrete roof and air-ducts. 

Location on wartime map (Writer's Collection)


Pillbox 16

This was a Beach Defence Unit consisting of PB and Lyon Light situated on the shoreline between Repulse Bay and Deep Water Bay, opposite Middle Island. Only the Lyon Light structure on a concrete tower has survived. The steel shutters still remain in the searchlight aperture. The entrance can be seen at the bottom of the tower structure in the photo below. There is an upper steel door into the searchlight , engine and accommodation compartment.  The two-man crew of the Lyon Light were in contact with the PB by voice pipe.

Lyon Light (Searchlight) LL 16 (Writer's Collection)

LL 16 showing the steel shutters in the aperture (Writer's Collection)

The PB was immediately below the LL tower. It can be seen in the photograph below showing a boat crew carrying their skiff ashore at Middle Island. The photo was taken from the book "Eastern Waters Eastern Winds. There is no sign of the PB anymore other than part of a concrete platform that could have formed its base. It was presumably demolished when the concrete pathway and dyke composed of large boulders/rocks was built (Seaview Promenade). The Lyon light is normally overgrown by thick vegetation. The undergrowth had been cut back when these photos were taken in January 2022. The date of the black and white photo showing the LL and PB is not known.

RHYC Crew coming ashore at Middle Island showing PB (Sourced: Eastern Waters Eastern Winds)

Notes from Mx War diary UKNA File: WO 172/1689:

PB Commander was Sgt George Tattam, 1/Mx 'C' Coy

'C' Coy were responsible for Beach Defence PBs from PB 12 (Brick Hill) to PB 20 (South Bay). C Coy Commander was Major Henry Marsh. Coy HQ was located at war shelters on Shouson Hill. 

Originally 2/Lt Cheeeswright was in command of PBs 15, 16 and 17. He spent a night in each PB in turn and when the Japanese reached Repulse Bay (20 Dec) he was in PB 17. After 2/Lt Grounds was killed at RBH - Cheesewright commanded  PB 16, 17, 18, 19, and 20. PBs 12, 13 and 15 were evacuated on 19 Dec (MX war Diary) (Leaving PB 14 isolated and PBs 16 to 20).

On 23 Dec  According to 2/Lt Cheeswright: PB 17, 18, 19 and 20 were evacuated to Stanley.  (What about PB 16?) It may have been evacuated earlier to avoid being cut off. Major Marsh writes that "16, 17, 18, 19, and 20 were successfully withdrawn to Stanley" (Mx War Diary) but PB 16 is not mentioned in the description of the withdrawal to Stanley by 2/Lt Cheesewright. Tattam (PB 16 Commander) was involved in the fighting at Stanley....... but what is not clear is whether his crew were evacuated on 23 Dec with 17,18,19 & 20 or separately on or or before this date. 

PB 16 is believed to be 3-loophole PB (?) probably built between 1939 and 1941.



Friday 14 January 2022

Anti-Aircraft Searchlights (AASL)

The Royal Engineers War Diary (UKNA  File: CAB 106/37) states that 22 Fortress Coy Royal Engineers was formed in 1937/38 to man the twenty-four anticipated AA Searchlight  (AASL) stations  located in Kowloon, the New Territories and on HK Island. Later following a revised defence plan that envisaged an evacuation of the Mainland and a defence of HK Island (the Island)  the number was reduced. There would be thirteen AASLs located on Hong Kong Island and some of the nearby islands including Aberdeen Island, Green Island and Stonecutters Island. The thirteen AASLs included the following:

Aberdeen Island
Austin (Mt)
Green Island 
Pottinger Gap
Repulse Bay
Sai Wan
Stonecutters Island
Stanley Fort
Tai Tam
WNC Gap 

The war diary states that the AASL detachments did not perform in the role anticipated. This was largely because there were no night raids. The Japanese Air Force restricted their combat missions to daylight hours. Three or four detachments were used to man the Defence Electric Lights (DELs) these were search lights used by the coastal defence batteries. The AASLs were manned at the outset of the battle but some were redeployed to DEL or other duties as it became clear that the Japanese were not carrying out night operations. 

A report issued by Lt-Col Lamb, RE, (UKNA File: WO 172/11400) stated that the AASL and DEL on Sonecutters Island was evacuated on 12 December 1941 confirming that the RE had already taken over the manning of some DELs and were manning the AASLs.  Lt-Col Lamb makes reference to the Collinson AASL being hit by shellfire on 13 December and the Sai Wan AASL station being attacked by Fifth Columnists. On 14 December he writes that the Green Island AASL was evacuated. Lamb describes how  on 15 December the Braemar AASL was relocated and redeployed to perform a DEL role at North Point i.e. the searchlight was to be used for the harbour rather than aerial usage. Lamb also mentions a second attack by Fifth Columnists on the Sai Wan AASL. On the same day the Aberdeen AASL (on Aberdeen Island) was damaged by aerial bombing. The RE also operated a searchlight referred to as a 'sentry beam' located near Pak Sha Wan Battery. After the Japanese landings there is no further reference to the AASL stations - presumably at that point there crews were all redeployed. Within a few days of the Japanese landings there were only three or four AASLs that could be utilised and still no night raids so they had become redundant. 

The AASL sites were usually fixed positions with reinforced concrete structures for the engine house and the store house. The engine house contained the diesel powered generator. The store house was used for storing the equipment and for the crew accommodation. The AASL crew consisted of ten to twelve men.   There may have been a flat platform or shallow depression for the searchlight. A sound locator would have been located close to the searchlight. The lights were 90 cm and 120cm in diameter.  The AA searchlight could be manhandled  on its caterpillar tracks. 


90cm AASL (Source: RAF Museum)

Source: Wikiwand
Source: Wikipedia