Operation Catechism was the last of nine attempts to sink or sabotage the Kriegsmarine

Kriegsmarine

The Kriegsmarine was the name of the German Navy during the Nazi regime . It superseded the Kaiserliche Marine of World War I and the post-war Reichsmarine. The Kriegsmarine was one of three official branches of the Wehrmacht, the unified armed forces of Nazi Germany.The Kriegsmarine grew rapidly...

 battleship

Battleship

A battleship is a large armored warship with a main battery consisting of heavy caliber guns. Battleships were larger, better armed and armored than cruisers and destroyers. As the largest armed ships in a fleet, battleships were used to attain command of the sea and represented the apex of a...

 Tirpitz

German battleship Tirpitz

Tirpitz was the second of two s built for the German Kriegsmarine during World War II. Named after Grand Admiral Alfred von Tirpitz, the architect of the Imperial Navy, the ship was laid down at the Kriegsmarinewerft in Wilhelmshaven in November 1936 and launched two and a half years later in April...

during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. On November 12, 1944, the RAF Bomber Command

RAF Bomber Command

RAF Bomber Command controlled the RAF's bomber forces from 1936 to 1968. During World War II the command destroyed a significant proportion of Nazi Germany's industries and many German cities, and in the 1960s stood at the peak of its postwar military power with the V bombers and a supplemental...

 dispatched 30 Avro Lancaster

Avro Lancaster

The Avro Lancaster is a British four-engined Second World War heavy bomber made initially by Avro for the Royal Air Force . It first saw active service in 1942, and together with the Handley Page Halifax it was one of the main heavy bombers of the RAF, the RCAF, and squadrons from other...

 heavy bomber

Heavy bomber

A heavy bomber is a bomber aircraft of the largest size and load carrying capacity, and usually the longest range.In New START, the term "heavy bomber" is used for two types of bombers:*one with a range greater than 8,000 kilometers...

s from No. 9 Squadron RAF and No. 617 Squadron RAF

No. 617 Squadron RAF

No. 617 Squadron is a Royal Air Force aircraft squadron based at RAF Lossiemouth in Scotland. It currently operates the Tornado GR4 in the ground attack and reconnaissance role...

 (including a film unit aircraft from No. 463 Squadron

No. 463 Squadron RAAF

No. 463 Squadron RAAF was a Royal Australian Air Force heavy bomber squadron during World War II. The squadron was formed in the United Kingdom on 25 November 1943 from personnel and aircraft allocated from No. 467 Squadron RAAF. The Squadron was equipped with Avro Lancaster bombers and flew its...

 of the Royal Australian Air Force

Royal Australian Air Force

The Royal Australian Air Force is the air force branch of the Australian Defence Force. The RAAF was formed in March 1921. It continues the traditions of the Australian Flying Corps , which was formed on 22 October 1912. The RAAF has taken part in many of the 20th century's major conflicts...

) from RAF Lossiemouth

RAF Lossiemouth

RAF Lossiemouth is a Royal Air Force station to the west of the town of Lossiemouth in Moray, Scotland. It is one of the RAF's biggest bases and is currently Britain's main base for Tornado GR4s. From 2013 the Northern QRA force of Typhoon F2 will relocate to Lossiemouth following the closure of...

 to the Tirpitz's mooring in Tromsø

Tromsø

Tromsø is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø.Tromsø city is the ninth largest urban area in Norway by population, and the seventh largest city in Norway by population...

, Norway; each one equipped with a Tallboy bomb. At least two bombs (one source says three) hit the Tirpitz, which suffered a violent internal explosion. The battleship capsized and remained bottom upwards (one source says the Tirpitz sank). Approximately 1,000 of the 1,900 men on board were killed or injured and one No. 9 Squadron RAF Lancaster was severely damaged by flak

Anti-aircraft warfare

NATO defines air defence as "all measures designed to nullify or reduce the effectiveness of hostile air action." They include ground and air based weapon systems, associated sensor systems, command and control arrangements and passive measures. It may be to protect naval, ground and air forces...

; it landed safely in neutral Sweden with its crew unhurt.
The final sinking of the battleship Tirpitz is attributable to 617 Squadron and the bomb dropped by the Commanding Officer, Group Captain Tait. On 12 November 2009 the attack was re-enacted in a competition between No. 9 and 617 Squadrons at Wainfleet Air Weapons Range, again 617 Squadron proved to be victorious.

The destruction of the Tirpitz meant that the threat from German surface ship attack against the Allied Artic convoys

Arctic convoys of World War II

The Arctic convoys of World War II travelled from the United Kingdom and North America to the northern ports of the Soviet Union—Arkhangelsk and Murmansk. There were 78 convoys between August 1941 and May 1945...

supplying the Soviet Union was considerably lessened, and several British capital ships could therefore be moved from the Atlantic to the Pacific.