On April 13th, the 1st Bn(M) 5th Inf began a two day search and destroy operation in the Filhol. C Company (-) of the 1/69th Armor was attached to the battalion along with 1 platoon of the 65th Engineers. The battalion task force was divided into three teams and a command group. At 0630 hours, all elements departed Cu Chi Base Camp through OP Ann Margret and the teams secured their respective objectives without opposition. The battalion command group established a task force forward base in the vicinity of XT 647207. As the teams conducted searches of their areas throughout the day, 7 APCs, 3 tanks and 1 VTR struck mines. 1 tank was struck by an RPG-2 round that penetrated through the tank and caused 1 minor injury. This was the first time that a tank of the 25th Division had been hit with an RPG round. Company B encountered a small group of VC in spider holes and tunnels who, by the use of snipers and rifle grenades, killed 5 and wounded 7 members of the company. The other teams suffered light casualties in scattered encounters. Companies A and C and the Recon Platoon closed into the battalion night base camp. B Company established its own perimeter as it was providing security for three tanks which had become mired and were not extracted until 2300 hours.