Taranto used large acoustic collectors along the coast to listen for aircraft and ship engines, providing limited warning without radar. The base had heavy anti-aircraft defences and was already at war. That distinguished November 1940 from the 1935 and 1938 plans for a pre-emptive attack or a strike as war began. Italian commanders expected reconnaissance aircraft to find a British force in time for the fleet to respond. Taranto therefore illustrates operational surprise: an attack reaching a defended wartime base without the chain of warning its leaders expected.
Notable Point · 1:10:02-1:12:43
Sound detectors could warn Taranto without preventing surprise
Italy lacked radar but fielded acoustic warning posts; the real vulnerability was confidence that reconnaissance would reveal a British approach in time.