War cabinet

A war cabinet is a committee formed by a government in a time of war. It is usually a subset of the full executive cabinet of ministers. It is also quite common for a war cabinet to have senior military officers and opposition politicians as members.

During the First World War, lengthy cabinet discussions came to be seen as a source of vacillation in Britain's war effort. In December 1916 it was proposed that the Prime Minister H. H. Asquith should delegate decision-making to a small, three-man committee chaired by the secretary of state for war David Lloyd George. Asquith initially agreed (provided he retained the right to chair the committee if he chose) before changing his mind after being infuriated by an article in The Times which portrayed the proposed change as a defeat for him. The political crisis grew from this point until Asquith was forced to resign as Prime Minister; he was succeeded by David Lloyd George who thereupon formed a small war cabinet. The original members of the war cabinet were:

Lloyd George, Curzon and Bonar Law served throughout the life of the war cabinet. Later members included:

Unlike a normal peacetime cabinet, few of these men had departmental responsibilities – Bonar Law, and then Chamberlain, served as chancellors of the exchequer, but the rest had no specific portfolio. Among others, the Foreign Secretary, Arthur Balfour, was never a member of the war cabinet, nor were the service ministers Lord Derby and Sir Edward Carson.

From the spring (in the northern hemisphere) of 1917, the Imperial War Cabinet was formed. It had representation from the Dominions. Its members were:

Germany invaded Poland early on 1 September 1939, and after to-ing and fro-ing with French Foreign Minister Georges Bonnet, an ultimatum was presented to the Germans and on its expiry war was declared at 11am on 3 September 1939.

...
Wikipedia