 In May 1919 , Marlborough conducted tests with new high @-@ explosive 6 @-@ inch shells off the Kerch Peninsula , though these proved to be unreliable . During this period , she operated a <unk> balloon to aid in spotting the fall of shot . Later that month , a shell broke up in the left barrel of " A " turret and caused minor damage . While stationed off the Kerch Peninsula , the ship provided artillery support to White troops , including bombardments of <unk> positions in the villages of Koi @-@ <unk> and <unk> <unk> . By 1920 , British attention had turned to the Greco @-@ Turkish War . On 20 June 1920 , Marlborough arrived in Constantinople , where the Mediterranean Fleet was being concentrated to support the occupation of the city . On 6 July , British forces landed at <unk> , while Marlborough provided artillery support . 
