sentences:  East of the 3rd Infantry, the 54th Regiment with two of its battalions defended the Mo Tau sector, while the reinforced 1st Infantry Regiment extended the line southeast to the Nui Bong area.The 1st Infantry had, in addition to its own three battalions, one battalion of the 51st Regiment, a company of M48 tanks and a troop of armored personnel carriers.The 15th Ranger Group, with its three battalions and one battalion of the 3rd Regiment, dug in on the hills above Highway 1 west of Phú Lộc District Town.