To the west, as IDF troops mopped up remaining resistance in Tyre and Sidon, the Israeli advance on Beirut continued, and Syrian tank and commando units were then deployed south of Beirut to reinforce the PLO. When the Israelis reached the Beirut suburb of Kafr Sill, they met a joint Syrian-PLO force for the first time, and fought a difficult battle to take it. The IDF temporarily halted its advance in the western sector at Kafr Sill.[1]