Winston Churchill was appointed First Lord of the Admiralty on 3 September 1939, the day that the United Kingdom declared war on Nazi Germany. He succeeded Neville Chamberlain as prime minister on 10 May 1940 and held the post until 26 July 1945. Out of office during the 1930s, Churchill had taken the lead in calling for British re-armament to counter the growing threat of militarism in Nazi Germany. As prime minister, he oversaw British involvement in the Allied war effort against the Axis powers. Churchill is seen as a victorious wartime leader who played an important role in defending Europe's liberal democracy against the spread of fascism, though some wartime events like the 1945 bombing of Dresden have generated controversy. He was the most important of the Allied leaders during the first half of the Second World War.
First Lord of the Admiralty: September 1939 to May 1940
The Phoney War and the Norwegian Campaign
On 3 September 1939, the day Britain declared war on Germany following the outbreak of the Second World War, Chamberlain appointed Churchill as First Lord of the Admiralty, the same position he had held at the beginning of the First World War. As such he was a member of Chamberlain's war cabinet. Churchill later claimed that, on learning of his appointment, the Board of Admiralty sent a signal to the Fleet: "Winston is back". Although this story was repeated by Lord Mountbatten in a speech at Edmonton in 1966, Richard Langworth notes that neither he nor Churchill's official biographer Martin Gilbert have found contemporary evidence to confirm it, suggesting that it may well be a later invention.
As First Lord, Churchill proved to be one of the highest-profile ministers during the so-called "Phoney War", when the only significant action by British forces was at sea. Churchill was ebullient after the Battle of the River Plate on 13 December 1939 and afterwards welcomed home the crews, congratulating them on "a brilliant sea fight" and saying that their actions in a cold, dark winter had "warmed the cockles of the British heart". On 16 February 1940, Churchill personally ordered Captain Philip Vian of the destroyer HMS Cossack to board the German supply ship Altmark in Norwegian waters and liberate some 300 British prisoners who had been captured by the Admiral Graf Spee. These actions, supplemented by his speeches, considerably enhanced Churchill's reputation.
He was concerned about German naval activity in the Baltic Sea and initially wanted to send a naval force there but this was soon changed to a plan, codenamed Operation Wilfred, to mine Norwegian waters and stop iron ore shipments from Narvik to Germany. There were disagreements about mining, both in the war cabinet and with the French government. As a result, Wilfred was delayed until 8 April 1940, the day before the German invasion of Norway was launched.
The Norway Debate and Chamberlain's resignation
After the Allies failed to prevent the German occupation of Norway, the Commons held an open debate from 7 to 9 May on the government's conduct of the war. This has come to be known as the Norway Debate and is renowned as one of the most significant events in parliamentary history. On the second day (Wednesday, 8 May), the Labour opposition called for a division which was in effect a vote of no confidence in Chamberlain's government. There was considerable support for Churchill on both sides of the House but, as a member of the government, he was obliged to speak on its behalf. He was called upon to wind up the debate, which placed him in the difficult position of having to defend the government without damaging his own prestige. Although the government won the vote, its majority was drastically reduced amid calls for a national government to be formed.
In the early hours of 10 May, German forces invaded Belgium, Luxembourg and the Netherlands as a prelude to their assault on France. Since the division vote, Chamberlain had been trying to form a coalition but Labour declared on the Friday afternoon that they would not serve under his leadership, although they would accept another Conservative. The only two candidates were Churchill and Lord Halifax, the Foreign Secretary. The matter had already been discussed at a meeting on the 9th between Chamberlain, Halifax, Churchill, and David Margesson, the government Chief Whip. Halifax admitted that he could not govern effectively as a member of the House of Lords and so Chamberlain advised the King to send for Churchill, who became prime minister. His first act was to write to Chamberlain and thank him for his support.