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How America Learned How to Hunt and Kill Submarines (Thank World War I)

Sebastien Roblin

Security, Americas

It would come in handy during World War II.

Key point: The Navy's experience was gained with blood, but it would help again against the Nazis during the Second Battle of the Atlantic.

When Congress voted on April 6, 1917 to declare war on Imperial Germany, the task before the U.S. Navy was clear: it needed to transport and supply over a million men across the Atlantic despite the Imperial German Navy’s ferocious U-Boat campaign, which reached its peak that month, sinking over 874,000 tons of shipping.

Indeed, Germany’s decision to recommence unrestricted submarine warfare in February was one of the decisive factors driving the United States, and later Brazil, into finally joining “the war to end all wars.”

While World War I submarines could only remain submerged for brief periods, they were highly successful at picking off unescorted merchants ship in the Atlantic and Mediterranean. Neither active sonar nor radar yet existed with which to track submarines, though the British had begun using hydrophones to listen for the noise of a submarine’s diesel engine.

The most successful anti-submarine ships were agile “torpedo-boat destroyers,” which sank U-Boats using deck guns and even ramming. Starting in 1916, Royal Navy vessels carried depth charge designed to detonate underwater, rupturing a submarine’s hull. These proved effective if the ship captains could guess the sub’s position. Statistically, naval mines proved deadliest, accounting for one-third of U-Boat losses.

For years, the Royal Navy resisted instituting a convoy system to guard merchant ships, preferring not to divert warships from offensive missions and believing the decrease in throughput from adhering to a convoy schedule would prove worse than the losses inflicted by U-Boats.

But that April, U-Boats had sunk one-quarter of all merchant ships bound for the UK, leaving it with just six week’s grain supply. Threatened with economic collapse, the Royal Navy finally instituted the convoy system. But the Brits had a problem: they could divert only forty-three out of the seventy-five destroyers required to escort convoys.

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