Admiral Oktyabrsky, commanding the Black Sea Fleet, was forced to reduce the number of coastal bombardment missions. Second Axis offensive Unternehmen Störfang Soviet defence Sevastopol was still a formidable obstacle. Its airfields provided a base for the Red Air Force to attack the Axis-held Soviet coastline and Romania proper. It was also home to the Black Sea Fleet. Its main fortifications were pointed seaward, while the land defences encircled the city at a distance of 15–20 km, with an inner defense belt at a range of 5 km. Enhancing the manmade defences was the forested, rugged terrain. To the north of Severnaya Bay there were 11 batteries and strongpoints. They were given morale-boosting names such as Stalin, Maxim Gorky I, Molotov, and Lenin. They were defended by the First Coastal Army. Elsewhere, the Red Army had constructed hundreds of timber bunkers with machinegun nests and 45 mm anti-tank artillery. Along the outer belt, concrete bunkers were less common, 19 being stretched across its 37 km. Soviet engineers laid thousands of mines, including PMD-6 wooden anti-personnel mines, TMD-40 wooden anti-tank mines, and barbed-wire obstacle belts. 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. Axis forces By this time, the Axis was facing a serious manpower and artillery shortage. The German 11th Army's divisions had anywhere between 35 and 75 percent of their initial strength. The German 22nd Infantry Division was the strongest division, and was only short 1,750 personnel, while the weakest was the 132nd Infantry Division, which was short 2,300 men. The 170th Infantry Division had to collapse