With the outbreak of the war,
Brummer followed her wartime purpose and conducted minelaying operation in the access to the Batltic Sea. At the beginning of 1940 she was used at as a commerce raider and later supported the German troops in Norway as a transporter. On her way back from Norway, on Janurary 14th, 1940,
Brummer was attacked by the British submarine
Sterlet. The torpedo attack cut off her bow, but the crew managed to keep the ship afloat for nine more hours before
Brummer finally sunk.
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