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9 photos of escort carriers, the U-boat killers

Fleet-sized aircraft carriers, such as the USS Enterprise and USS Midway, captured the public’s attention during the air battles of World War II.

But the majority of the US Navy’s aircraft carriers during the war were actually smaller, lesser known vessels: Escort carriers.

There were five different classes of escort carriers, all of which varied slightly. But in general, they were about half the size of fleet-sized carriers.

The Casablanca-class, which had the largest number built with 50 hulls, typically carried 28 aircraft, including 12 Grumman TBF Avengers torpedo bombers and 16 F4F Wildcats fighters, Timothy Bostic, a reference librarian at the Navy Department Library, told Business Insider.

Referred to as “Jeep carriers” or “baby flap tops” by the press, escort carriers were slow, lightly armored and had few defensive weapons.

But they were also expert at hunting and killing enemy submarines, and exacted a heavy toll on Germany’s U-boats.

Here’s how they did it.


9 photos of escort carriers, the U-boat killers

The USS Long Island underway in May 1943.

When German U-boats began sinking convoy ships in the beginning of the war, Great Britain asked the US for help, which responded by building escort carriers. The first escort carrier was the USS Long Island, which was built from an old freighter and launched in January 1940.

Source: US Navy

9 photos of escort carriers, the U-boat killers

The USS Chenango (CVE-28) off Mare Island Navy Yard, California on 22 September 1943.

The US then built four more from oiler hulls, including the Chenango, which were sent to help with landings in North Africa, where they proved extremely successful in anti-submarine warfare. This led to the building of dozens more and deployments to the Pacific.

In total, the US built and launched 78 escort carriers between 1941-1945.

Source: US Navy

9 photos of escort carriers, the U-boat killers

The USS Sangamon (CVE-26) anchored off the the Solomons in 1943.

Escort carriers had initially been used to protect convoys, ferrying planes, among other duties. But by 1943, the US had evolved its tactics to hunt and kill U-boats.

Source: US Naval Institute

9 photos of escort carriers, the U-boat killers

The USS Bogue (CVE-9) underway near Norfolk in June 1943.

In May 1943, the USS Bogue scored the first escort carrier kill of a German U-boat after spotting the surfaced U-231 and sent a Grumman TBF Avenger torpedo bomber after it, which released four depth bombs and took it out as it tried to submerge.

Source: US Naval Institute

9 photos of escort carriers, the U-boat killers

A US Navy landing signal officer guides a Grumman TBF-1 Avenger on board the USS Card.

9 photos of escort carriers, the U-boat killers

The USS Core (CVE-13) in 1943 or 1944.

But what led to the escort carriers’ eventual success over the German U-boats was the Allies code-breaking U-boat radio traffic in 1943, providing escort carriers with accurate locations of enemy submarines.

Source: US Naval Institute

9 photos of escort carriers, the U-boat killers

USS Card (CVE-11) underway off Virginia in March 1943.

This breakthrough also allowed the Allies to hunt and kill German U-tankers, or “Milch Cows,” which refueled the short-range U-boats at sea.

Source: US Naval Institute

9 photos of escort carriers, the U-boat killers

The US Navy escort carrier USS Santee (CVE-29) anchored in October 1942.

This new knowledge of German U-boat and U-tankers allowed the Allies to evolve their tactics, sending escort carriers with destroyers away from their convoys to hunt and destroy the enemy submarines.

Source: US Navy

9 photos of escort carriers, the U-boat killers

USS Card CVE-11 in 1944.

By the war’s end, escort carriers had sunk a total of 53 German U-boats.

Source: US Naval Institute

This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.

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