 The defences of Kaafjord were improved following Operation Tungsten . Prior to this raid they had comprised eleven batteries of anti @-@ aircraft guns , several anti @-@ aircraft warships and a system of smoke generators capable of hiding Tirpitz from aircraft . After the attack , additional radar stations and observation posts were established and the number of smoke generators located around the battleship was increased . The improved defences in place by the time of Operation Mascot included a cliff @-@ top observation post near Kaafjord , which was capable of directing the battleship 's anti @-@ aircraft guns if necessary . Tirpitz 's air defences were also strengthened during the period she was under repair by fitting additional 20 @-@ millimetre ( 0 @.@ 79 in ) cannons , modifying the 150 mm guns so they could be used to attack aircraft , and supplying anti @-@ aircraft shells for her 380 @-@ millimetre ( 15 in ) main guns . 
