 Operation Mascot was an unsuccessful British carrier air raid conducted against the German battleship Tirpitz at her anchorage in Kaafjord , Norway , on 17 July 1944 . The attack was one of a series of strikes against the battleship launched from aircraft carriers between April and August 1944 , and was initiated after Allied intelligence determined that the damage inflicted during the Operation Tungsten raid on 3 April had been repaired . 
