The PAVN quickly adapted when they realized the barrage of artillery fire was more than mere coincidence; a battalion-size force was heading toward Nui Vu. On the night of June 15, a Special Forces team spotted the advancing enemy presence and alerted headquarters. However, they relayed the information too late. SSgt Howard had heard the enemy forces approach them as they amassed below them at the bottom of the hill. While the next few hours were quiet, by midnight, several of Howard's men spotted silhouettes as dozens of PAVN soldiers furtively climbed up the hill in the darkness. The PAVN instigated the fight by throwing grenades at the Marines. Greatly outnumbered, Howard's men held off the attackers.