[citation needed] On one occasion he was buried alive by an explosion for twenty minutes, and on another in 1916 he was castrated by shrapnel, requiring him to wear a surgical truss for the rest of his life.

Crookshank called Chamberlain "crazed and hypnotised by a loony" to have accepted the Munich Agreement and sent a letter of resignation in protest, but was convinced to rescind it.

[3] In 1942 he was offered the post of British Minister Resident in the Mediterranean at Algiers following the liberation of Algeria by Operation Torch but he declined, Harold Macmillan being appointed instead.

[3][8] He had been offered a peerage in February 1940 but declined, having considered it at the time an insult because his First World War wounds had left him incapable of fathering any heir to a title.

[9] Papers released by The National Archives, London, November 2007, show that Crookshank, with Harold Macmillan, led a faction within the third Churchill ministry who opposed what they perceived to be an attempt to bounce the Cabinet into a premature decision to authorise a British thermonuclear bomb programme in July 1954.

[12] His home from 1937 was at 51 Pont Street, Kensington, London, where in 1947 he hosted a meeting of like-minded backbench MPs who unsuccessfully demanded Churchill's removal as Leader of the Conservative Party.