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WWII Military Timeline

 

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Motutapu 6inch Mk21 Gun Battery

75 year Time Line - 1933 to Present Day

1933

Jun

Construction authorised as part of a 6 year NZ army modernisation programme

 

Nov

Sites investigated. Red Bluff near Milford (NZ choice) was deemed unsuitable by the War Office as Counter Bombardment Batteries needed to be built well in advance of the object they are required to defend. War office suggests Rangitoto. Agreed on Motutapu as a 6inch 45degree battery would provide complete defense against bombardment by 8 inch cruisers operating between Tiri and the Noises (their extreme range)

1935

Oct

Relief workers clear battery and barracks site of scrub

1936

Mar

Apr

Contract let for construction of gun emplacements and associated buildings to Brays Construction under Public Works Department supervision
Road access from Home Bay to site completed

 

May

Majority of construction equipment arrives on site
Excavation work commences
Road constructed to Pig Bay to obtain sand for the construction of hte underground magazines

 

Jun
Jul

First two gun barrels and associated equipment delivered
Quarry was begun at Home Bay to supply road metal

 

Sept
Oct

Work well advanced on two magazines
Work began on the Home Bay wharf, Public Works camp set up at Home Bay to accommodate workers

 

Dec

All three magazines and burster slabs completed

1937

Jan
Feb

All three emplacements excavated
Road constructed to Pig Bay to obtain sand for construction of the underground magazines

 

Jun

Emplacements construction complete
Battery Observation post completed
Command Post, engine, radio and plotting rooms complete.
Observation and Fire Commander's posts completed at Matiatia and RangitotoAdministration Bay barracks site drained, watercourses alteredWorkers camp established
Watch room behind the battery completed

 

Sep

3rd gun barrel delivered together with associated equipment
Emplacements completed and grassed

 

Nov

Constuction of barracks at Administration Bay commences

 

Dec

Army begins installation of armaments

1938

Mar

Guns shipped to Home Bay and trucked to the emplacements
Gun 1 mounted

 

Aug

Guns 2 and 3 mounted
Magazines interior fitout complete
Administration Bay admin block, guardroom, mess and storerooms completed and handed over to the army
Gun test firings commence

 

Sep

Army HQ Wgtn advised that 'proofing' of the Battery carried out by Northern Military District Commander on 9th Sept. Battery is ready.

 

 

Top secret radar experiments (shore to sea, shore to air radar tracking systems) comence under Sir Ernest Marsden (had spit the atom earlier with Rutherford). Activites are housed alongside the Battery Observation Post. Was called the 'HS and C' (Hightly Secret and Confidential)

1939

Sep

Allies declare war on Germany, 3 September, following German invasion of Poland
Population on Island increases from 10 to 200 overnight

 

 

Financial approval for final outfitting of Battery camp and the outlaying observation post camps
Rugby matches played at 'Dutchy' Looman's sheep paddock at Home Bay

1940

Aug

German raider Orion sinks the steamer Orion off Cape Egmont

 

Sep

Germany, Italy and Japan sign pact

 

Oct

Battery Camp complete
6 barrack buildings, officers quarters, dining rooms, rec rooms, hospital etc.. capable of accomodating 300 men completed
Construction of smaller camps at observation posts completed

 

Nov

German raiders sink Holmwood (off Chatham Islands) and Rangitane (off East Cape)

1941

Jul

All married men in unreserved occupations called up for military service

 

Aug

Decision made to relocate Plotting room, radio and engine rooms underground - work commences
Searchlights authorised for emplacement at Billy Goat Point (to illiminate vessels attempting nighttime apporach)

 

Dec

Japan attacks Pearl Harbour 7 December
Britain surrenders Hong Kong to Japanese, 25 December
NZ 'ers have first contact with enemy (67 squadron RAF) during Japanese raid on Rangoon

1942

Jan

Fearing land assault, short range howitzer battery arrive on island (three 3.7 inch howitzers WWI guns). Howitzers located on hill behind battery - ability to fire on main landing beaches.
Barbed wire laid along all main landing beaches
Ring of 17 pillboxes built to guard battery and adjacent gulleys

 

Feb

Singapore surrenders to Japanese
First enemy air raids on Darwin (total of 64 raids between Feb 1942 and Nov 1943)
Temp Infantry camp built near the underground complex under construction

 

Mar

13 Mar, seaplane from Japanese submarine I25 overflies Auckland photographing defenses at dawn.
Road from Islington Bay to Administration Bay completed by Fletcher Construction for the army
Light and medium anti-aircraft guns (Oerkilons and Bofors) positioned on ridges around the guns
Light Lewis machine guns mounted on roof of Command Post and the Battery Observation Post

 

 

US Admiral Nimitz assumes responsibility for South Pacific (including New Zealand)

 

 

US Navy identifies Auckland as a major US Navy base. Fleet anchorage between Tiri and Rangitoto.
Plans drawn up to create appropriate support facilites.
Construction commences

 

April

NZ prepares for possible invasion - City evacuation plans prepared
Construction of the Controlled Mine Base at Islington Bay, Rangitoto commences (completed - May 1943)

 

May

Japanese forces heading for Port Moresby suffer setback in battle of The Coral Sea, 8 May
24 May, seaplane from Japanese submarine I21 overflies Auckland's defenses, again at dawn (believe this is the floatplane seen by Major Derek Thorburn and reported to North Head, they told him ' not to worry as its not one of ours'.)

 

 

Japanese Midget subs attack Sydney Harbour, 31 May (Group of submarines assembled off Sydney commanded by Commander Imada Hiroshi, from the same submarine 121)

 

Jun

US victory at Battle of Midway effectively ends any danger of NZ invasion

 

July

Underground facilites and tunnels completed

 

Aug

Air raid drills being held regularly in NZ schools
Allies land offensive at Guadalcanal

 

Sep

US Navy identifies Auckland as a major US Navy base

 

Dec

Billy Goat searchlights (2) plus directing station, power supply and crew accommodation completed (to minimal design) to counter midget submarine, torpedo boats entering the harbour.

1943

Jan

Japan commence withdrawing forces from Gauadalcanal

 

Jul

USNavy completes construction of 50 large concrete underground magazines (24mtrs x 6mtrs) at south western end of island liked by 11km of new road.
Camp for US Marines to sevice the magazines built on northern side of the road above the current rangers house at Islington Bay
Large support storage facility at Home Bay completed and later used for some time by the NZ Army (removed in 1950's and relocated to Papakura Military Camp - concrete floor still obvious next to camp toilet block).
9km of link roads plus a wharf (Yankee Wharf) at Islington Bay and a causeway linking the two islands (the fleet never came and the magazines were never used)

 

Aug

Allied and US troops retake Georgia and Solomon Islands
Threat of attack on New Zealand recedes, Motutapu assumes more relaxed atmosphere. Planned additonal defence projects halted

 

Sep

Australians capture Lae, New Guinea and attack Japanese ships in Singapore

 

Oct

3 NZ Division secures Vella Lavella

 

Nov

Risk of attack dimishes, War in the Pacific has moved north
Troops and artillery withdrawn and temp camp abandoned

1944

Jan

Battery placed in reserve (guns manned only at dawn/dusk - 1 gun could be fired within 10 mins, Gun 2 and 3 within 30 mins)

 

 

RNZN establishes Anti Submarine Fixed Defense Station ("Emu") in front of the Battery Observation Post to listen for subs and ships
Radar fire control installed rendering Fortress System obsolete (ability to plot both range and bearing day and night). Observation Posts abandoned

 

Jun

Dawn/dusk manning discontinued
D Day - Allied landing in Normandy

 

Oct

Gen MacArthur returns to Phillipines
Army engineers remove barbed wire from coast.
Dismantle buildings at all camps exept the Mine Base, HMNZS Emu and the artillery camp at Administration Bay
Only 50 people remain at artillery camp, mainly staff and service crew for the radar units

 

Nov

Allied planes bomb Singapore and B-29's bombTokyo

1945

Jan

German submarine U 862 cruises into Gisborne and Napier ports looking for suitable vessels to attack (didn't find anything worthwhile but got close enough to watch couples dancing in the street cafes)

 

Feb

US flag raised over Iwo Jima

 

May

British liberate Rangoon, Burma

 

Jun

US troops liberate Phillipines

 

Aug

US drops bomb on Hiroshima 6th Aug, Nagasaki 9th Aug

 

 

Germany surrenders on 8 August

 

Sep

Japanese surrenders unconditionally on 2 September aboard the USS Missouri

1946

Jan

 

Sep

Battery now only used for training
Both Whangaparoa and Motutapu now termed 'Port Approaches Batteries'. Both using fire control radar - greatly extending their range and effectiveness
Restrictions on public access lifted except for the camp areas
Remaining W.A.A.C's and service crews leave the island
Administration Bay camp begins use by territorials as part of the Compulsory Military Training (CMT). Continues through the late 1940's and 1950's.

1951

 

Battery closed and placed in reserve
Long range fire responsibilities now assumed by the 9.2inch battery at Whangaparoa

1953

 

Whangaparoa Battery laid up
Long Range responsibilities again assumed by Motutapu
Training recommences

1955

 

Personnel withdrawals commence heralding the end of NZ's coastal artillery
Live firing exercises continue

1957

Mar

Coast Artillery disbanded following Defense Force review (in common with Aust, Canada and Britain)
Motutapu battery now laid up. Recognition fixed coastal defences no longer part of modern military thinking

1958

 

Battery area stripped of any salvageable material - only the guns remain

1960

 

Guns offered for sale

1961

1962

Jan

Successful purchaser, Bradmand and Co, cuts up the guns for scrap
Army uses Administration Bay camp for training and storage
Administration Camp now empty (due to the decline of CMT, easing of Cold War tensions)

1966

 

Administration Bay facilities begin operating as an outdoor education camp

1970

Feb

Army vests all the battery land under the control of the Hauraki Gulf Maritime Park Board

 

 

Park Board re-establishes an outdoor education camp at the barracks area of Administration Bay

 

 

The Battery land later passes to the Department of Conservation

1991

 

The Motutapu Outdoor Education Trust is formed and assumes the lease from DOC

Today

 

The Administration Bay complex continues to be managed by the Outdoor Education Trust (MOEC) offering a huge range of activities to thousands of Auckland's kids annually.

Special thanks to Peter D Corbett's 'A First Class Defended Port' Department of Conservation, published July 2003, Motutapu Restoration Trust's Chris Keenan and Major Derek Thorburns nephew, Ian Maxwell for their contributions to this timeline. Thanks also to Mary Flaws for lending her prized copy of the MOEC Teacher Resource Handbook, by Bryan Dowdle for DoC and the Department of Education published 1988.

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