Later that day the German artillery arrived and started bombardment of both the fortress and the town. Heavy street fighting ensued. At dawn approximately half of the town was in German hands, the other half being defended by Polish infantry. Polish anti-tank weapons, artillery and AA guns were very scarce and were unable provide enough support for the infantry. The following day Polish defenders withdrew from the town, but heavy casualties on both sides prevented the German units from continuing the attacks on the fortress. Instead, it was constantly shelled with artillery and bombed by the Luftwaffe.