losses on 7 June amounted to 2,357 casualties in four divisions, including 340 killed. It had also expended 3,939 tons of ammunition. The 132nd Division had exhausted all of its basic munitions load by midday. On the other side, the formidable Soviet defence lines east and southeast of Belbek had been overrun, and the Germans succeeded in advancing 2 km through dense Soviet defences. The Soviet casualties had also been severe. It is estimated that three battalions were effectively destroyed. Manstein recognised the seriousness of the failure on 8 June. He was worried that the 132nd Infantry Division, locked in combat with the 79th Naval Brigade and 95th and 172nd Rifle Divisions north of the city on the Belbek river front, was "approaching the end of its strength". Once again, the army turned to the Luftwaffe for support. Richthofen responded by ordering attacks against Soviet supply lines. The same day, German bombers, including KG 100, began attacks on Soviet shipping. They sank the destroyer Sovershennyy and the survey vessel Gyuys, with the 4,727 ton transport Abkhaziya and destroyer Svobodnyy following them on 10 June. The period between 8–12 June descended into a battle of attrition. Several Soviet counterattacks were repulsed with heavy losses. The German LIV Corps extended the salient on the seam of the III and IV sector to 3 km, determined to break through before Petrov could reinforce his lines. The 132nd Infantry Division cleared the Haccius Ridge while the 22nd Infantry Division overran most of the Soviet 79th Naval Infantry Brigade. The Soviet unit tried counterattacking on 10 June, but was repulsed. The Soviet formation was effectively destroyed, with the support of the Luftwaffe, which used anti-personnel bombs against Soviet infantry caught in the open. Only one battalion (the Soviet 1st Batt./241st Rifle Regiment) was in a position to block the Germans from encircling the Maxim Gorky fort. Still, on 8 June LIV Corps had lost 1,700 men. In return, the lodgement in Soviet lines was extended to 3 km deep and 5 km wide. In the south, XXX Corps made no progress in four days of attacks. They suffered 496 casualties at the hands of the 109th Rifle Division. The 28th Light and 72nd Infantry Divisions had succeeded in puncturing the Soviet lines opposite the 109th and 388th Rifle Divisions. The outer defences were broken in some parts, but the most were still in Soviet hands