Operation Regenbogen
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During World War II, there were two German operations called Regenbogen (Rainbow):
- an unsuccessful attack on the Arctic convoy JW-51B, by heavy cruisers Admiral Hipper and Lutzow, known as the Battle of the Barents Sea
- an order from Admiral Karl Dönitz to scuttle Kriegsmarine warships at the end of the war. Rescinded as a condition of the surrender but actioned by many U-boat crews.