At 18:00 Egyptian armor and anti-tank units on the west bank began moving to the crossing sites. Fifteen minutes later engineers completed the assembly of all 35 ferries and waited for the breaches to be opened. By 18:30 the bridgeheads were nearly five kilometers (3 mi) deep. With Israeli artillery on the Bar Lev Line eliminated, the immobile SA-2 and SA-3 units were moved forward. From 22:30 to 01:30 after midnight, all bridges—eight heavy and four light—were laid, and along with the ferries, began transporting reinforcements to the opposite bank. In the far south of the canal, at 19th Division's sector, the sand turned into mud making it difficult to clear. Consequently, four ferries and three bridges assigned to that division were deployed seven hours behind schedule. Periodically the bridges were relocated to confuse Israeli air strikes targeting them—the Egyptians had opened 60 passages but were operating only 12 bridges, allowing each bridge to be moved to one of five passages. Throughout the night and up to the following morning, tanks and vehicles kept crossing the canal. Military police were responsible for directing this enormous traffic, utilizing color-coded signs.