petrov, commanding the independent coastal army, had a powerful artillery pool. petrov had on strength some 455 artillery pieces and howitzers. among those were 34 152 mm and 40 122 mm howitzers and 918 mortars. ammunition was adequate for a battle of two weeks for these calibers, but 82 mm mortar ammunition was in short supply. the battles of the crimean campaign had taken their toll, and scarcely any tank and anti-aircraft artillery support were available. a further force, under major-general petr morgunov, was added. the coastal artillery force was semi-independent for much of the siege, and had an initial strength of 12 batteries and 45 guns, although more were added during 1942. by the time of the german june offensive, the soviet forces had available eight 305 mm, one 188 mm, 10 152 mm and 17 130 mm, three 120 mm, eight 100 mm, and four 45 mm guns.