Danckwerts was made a
sub-lieutenant in the
Royal Naval Volunteer Reserve at the beginning of the Second World War, and was trained as a
bomb disposal officer. In 1940 he was posted to the
Port of London Authority, and received the
George Cross for the "great gallantry and undaunted devotion to duty" he showed in defusing
land mines dropped by the
Luftwaffe on
London: despite not being trained to handle magnetic mines, he volunteered to attempt to defuse them, which he did successfully, on one occasion working continuously for almost two days, dealing with 16 mines. Later in the war he undertook bomb disposal work abroad and was wounded in a minefield in Sicily, after which he was posted to the
Combined Operations Headquarters in
Whitehall. ==Post-war career==