Anti-submarine expertise formed a deliberate career path. Martin Dunbar-Nasmith's leadership of the submarine service, the Rear Admiral (Destroyers) appointments held by officers such as Andrew Cunningham, and Max Horton's later Atlantic command after Percy Noble connect interwar specialization to wartime leadership. Destroyer admirals also had to understand surface attack and air defence because their flotillas performed several protective roles. The loss of experienced officers at the start of the war, especially Hugh Sinclair, created an institutional problem. Underwater warfare remained a contest of prediction in which technical contacts were most useful when informed by intelligence and judgement.
Chapter · 34:22-40:34
ASW depended on specialist officers and intelligence
The Royal Navy cultivated anti-submarine specialists, but effective undersea warfare also required intelligence that could anticipate an opponent's choices.