the pressure took its toll, and between the 18–23 june, the entire soviet defence line in the north collapsed. the remnants of the 95th rifle division was huddled into a 2 km square portion of coast line near coastal battery 12, north of the bay. at 09:00 the battery and the division surrendered to the 132nd infantry division. further south the 24th infantry division captured bartenyevka, on the mouth of the bay. the 22nd infantry division had reached the north of the bay on the same day. the soviet 138th naval brigade counterattacked, but it was destroyed without artillery and air support. on 20 june, the 24th infantry division tackled the main obstacle remaining on the north side of the bay. the lenin anti-aircraft position protected by the northern fort, a position which had a 5 metres wide anti-tank ditch, 1,000 mines, 32 concrete bunkers, seven armoured cupolas, and 70 earth-and-timber bunkers making it a formidable defensive position. the lenin defences surrendered, having already lost three of their four 76 mm weapons. the germans tried to use the remote-controlled mines to break into the north fort, but they were knocked out. at 11:30 on 21 june the fort fell after a sustained infantry attack. around 182 soviet prisoners were taken. the germans began mopping up operations and clearing the northern shore. most soviet units were exhausted and out of ammunition, surrendering quickly. others made attempts at a last stand. some tried to evacuate across to the southern side by boat, but they were picked off by german artillery.