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American Civilians Defend Against U-Boats

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Authors: Timothy Gay

Historic Era: Era 8: The Great Depression and World War II (1929-1945)

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Spring 2020 | Volume 65, Issue 2

Allied tanker torpedoed off US waters
An Allied tanker sinks after being torpedoed off US waters.

The killing machine known as Unterseebooten-507 skulked, undetected, through the murky yellow water at the mouth of the Mississippi River, practically within shouting distance of the Louisiana shore. Six full months after Nazi Germany’s declaration of war against the United States, not a single airplane – military, civilian, or otherwise – was surveilling Chandeleur Sound as U-507 crept closer and closer to the mainland.

On orders from Kriegsmarine U-boat Admiral head Karl Dönitz, U-507 and her insidious partner, U-506, had spent the previous two weeks pummeling merchant ships in the Gulf of Mexico. Hitler and Dönitz were hellbent on using submarine attacks to undercut American morale and undermine the Allies’ capacity to wage war. 

German U-boats sank 233 ships in American waters and killed 5,000 seamen and passengers.

In her 12 days in the Gulf, U-507 alone had sunk eight freighters, four of them oil tankers, inflicting hundreds of casualties. Beachcombers from Brownsville to Biloxi watched in horror as human remains washed ashore amid boat wreckage and oil slicks. Just as they had up and down the East Coast, Nazi submarines were spreading panic in the Gulf, triggering shrill headlines (“WAKE UP, GALVESTON!”) and sparking fears of Fifth Column saboteurs signaling enemy ships from coastal hideaways.

Harro Schacht commanded the U-507 for five tours in the Americas, sinking 19 ships totaling 77,143 tons. He died January 13, 1943 when a U.S. Navy Catalina dropped depth charges on U-507, with all hands lost.
Harro Schacht commanded U-507 for five tours in the Americas, sinking 19 ships totaling 77,143 tons. He died on January 13, 1943 when a U.S. Navy Catalina dropped depth charges on his sub off the coast of Brazil, with all hands lost.

Now, a few minutes after three o’clock on Tuesday afternoon, May 12, 1942, the 245-foot leviathan – nearly three-fourths the length of a football field – was again waiting to strike, this time submerged in shallow water. Just eight meters separated her hull from Delta muck. The Gulf churn was unusually calm, unbothered by a light breeze. The skies were clear; so was the view from U-507’s periscope. 

Moments before, her skipper, Korvettenkapitäin Harro Schacht, had glimpsed through his ‘scope a pair of U.S. Navy patrol craft hovering close to shore. But Schacht didn’t budge: he knew from intelligence reports – quite possibly fashioned by Nazi Germany’s one-time consul-general in New Orleans, Baron Edgar von Spiegel, who had taken copious notes while on prewar “fishing trips” – that fat pickings were likely to appear at the mouth’s Southwestern Pass. 

Soon enough, Schacht spotted the S.S. Virginia, an unescorted and unarmed 10,000-ton tanker that in Baytown, Texas, had been loaded with 180,000 barrels of gasoline. Before heading upriver to Baton Rouge, the Virginia had anchored abreast a buoy, waiting on a pilot to be ferried from