U-47 penetrates Scapa Flow
Günther Prien takes U-47 through the incomplete blockship defences of Scapa Flow and attacks HMS Royal Oak at anchor. After an initial torpedo causes limited damage, a second attack produces catastrophic explosions. The battleship capsizes and sinks with 835 men and boys dead. The Home Fleet's principal wartime anchorage has been penetrated by a single submarine. Royal Oak is not carrying Atlantic cargo, but the attack has immediate consequences for the wider maritime war. The Home Fleet is dispersed while Scapa's entrances and defences are strengthened, consuming ships, engineering work…
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