on 12 June. The main belt on the Sapun Ridge (Sapun-gora) was unbroken. Soviet casualties amounted to 2,500, including 700 captured. By 13 June, XXX Corps had lost 2,659 men, including 394 killed. Air-land operations: 11–15 June As the Germans made slow progress toward the main train station, Petrov withdrew the battered 172nd Rifle Division and replaced it with 345th Rifle Division. The 95th Rifle Division halted the 132nd Division's progress in the north. Although a relatively quiet day, 10 June saw the elimination of the Soviet 79th Naval Brigade and LIV Corps lost 2,772 men. Counterattacks by the Soviet 345th Division aimed at the hinge between the German 132nd and 50th Divisions were repulsed by the Luftwaffe. On 11–12 June, LIV Corps lost another 1,957 men. The Red Army had committed all of its reserves and were stretched dangerously thin. One more push might collapse the northern sector. But at this time, the tired German infantry were running short on reinforcements and ammunition. In contrast, the Black Sea Fleet was bringing in reinforcements through Luftwaffe attacks. On 12 June the cruiser Molotov and destroyer Bditel'nyy brought in 2,314 soldiers, 190 tons of ammunition and 28 artillery pieces. The Luftwaffe turned its attention to these convoys. On 13 June it sank the transports Gruzyia and TSch-27, patrol boat SKA-092, motor boat SP-40, five barges, and a floating crane. On 15 June another 3,400 soldiers, 442 tons of ammunition, 30 tons of fuel and 12 tons of provisions reinforced the Soviet positions. The Luftwaffe had flown 1,044 sorties on 11 June, dropping 954 tons of bombs. The consumption rate of ammunition was putting von Richthofen's logistical network under strain and he could no longer afford to fly massed bombing raids. On 11 June, he surmised there was less than two days worth of munitions left, requiring a change of tactics. Instead of carpet bombing, fewer targets would be attacked simultaneously, and aircraft would strike at designated targets in long and narrow lines. This was designed to maintain accurate pressure without wasting ordnance. Even this failed to alleviate shortages in the long term. By 17 June, scarcity of aviation fuel meant the Luftwaffe dropped only 800 instead of the planned 1,000 tons of bombs. Adding to the Luftwaffe's troubles in the sector, von Richthofen was transferred to prepare the Corps' Headquarters near Kursk to support the upcoming Operation Blue, the German summer