 On 16 March, Mike Company, 3/3 Marines and Charlie Company, 1/4 Marines clashed with another battalion-sized PAVN force.The two Marine companies called in artillery and air upon the PAVN, the bulk of which disengaged, leaving a company behind to fight a rearguard action.PAVN artillery from north of the DMZ answered the American supporting arms with a 400-round barrage of its own on the Marines.