Following the outbreak of war in 1939, most memories of 1936 faded and Hamilton was throwing all his efforts into the Air war, the aerial defence of his sector of Southern Scotland and Northern England.
Following the outbreak of war in 1939, most memories of 1936 faded. In 1940, upon his father's death, Hamilton succeded to the Dukedom and was exerting all his efforts into the Air war, the aerial defence of his sector of Southern Scotland and Northern England.