On September 4, 1941 , a tense and historic drama unfolded in the icy waters of the North Atlantic near Iceland, signaling a turning point in the escalating clash between the United States and Nazi Germany long before America formally entered World War II. The protagonists: the USS Greer (DD–145), an American destroyer en route to Iceland with mail and supplies, and the German submarine U-652, prowling the seas with deadly intent.

The USS Greer received a warning at dawn from a British bomber spotting a submerged German U-boat ahead. Acting on this intelligence, the Greer began to track the submarine using its underwater sound equipment, maintaining contact and repeatedly broadcasting the U-boat’s position to allied aircraft, which dropped depth charges in the submarine’s vicini

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