The U-Boat commander who almost killed Churchill

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The Battle of the St. Lawrence - Legion Magazine

We Shall Fight on the Beaches - International Churchill Society

Winston Churchill's secret voyage (Part one) - The National

Did Germany lose the submarine war quickly? - Quora

The battle that frightened Churchill: the war in the Atlantic

Submarines Attack in the St. Lawrence : Juno Beach Centre

Letter to Winston Churchill

The U-Boat commander who almost killed Churchill

Churchill's World - Twentieth-Century Fighting Sail

The Scuttling of the German Fleet 1919

Fighting Jack Churchill - Historic UK

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Günther Prien - Wikipedia

The Sensational Surrender of Four Nazi U-boats at the Portsmouth

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