 Other changes made during the war ( exactly when these occurred is unknown ) included the replacement of ' A ' gun by a Hedgehog anti @-@ submarine <unk> mortar , exchanging her two quadruple .50 @-@ calibre Vickers machine guns mounted between her funnels for two Oerlikon 20 mm AA guns , the addition of two Oerlikon guns to her <unk> platform , and the removal of her 12 @-@ pounder AA gun . Type 286 short @-@ range surface search radar was also added . Two QF 6 pounder <unk> guns were fitted on the wings of her bridge to deal with U @-@ boats at short ranges . ' Y ' gun was also removed to allow her depth charge stowage to be increased to at least 60 depth charges . 
