sentences:  At dawn on 9 April the PAVN launched an attack, led by tanks, against Firebase Pedro southwest of Quảng Trị.The PAVN tanks had outrun their infantry support and 9 tanks were lost in a minefield around Pedro.An armored task force of 8 M48s and 12 M113s from the ARVN 20th Tank Battalion were despatched from Ái Tử to support the Marines at Pedro.