 Evstafi was fitted with anti @-@ aircraft guns on top of each of her turrets during 1915 and screens were added on top of her funnels to keep out light bombs . She first received three 75 mm guns , but these were later replaced by two 63 @.@ 5 @-@ millimetre ( 2 @.@ 5 in ) guns and a pair of 40 @-@ millimetre ( 1 @.@ 6 in ) guns . 
