 The sound of gunfire alerted base sentries who secured the gate and sounded the alarm.A .30-caliber machine gun on the second floor of the headquarters disabled both cars and killed or wounded several sappers while the Navy security force organized a counterattack.Simultaneously a U.S. Navy advisor contacted the U.S. military police who soon attacked the VC from adjoining streets, the resulting crossfire ended the attack, killing eight sappers with two captured.