 The battle eventually stagnated and became a periodic trade of artillery barrages.This was most probably a result of casualties sustained in the frustrated attacks on heavily entrenched enemy positions in control of a withering array of supporting firepower.On 12 April a relief force of the 32nd Regiment, 21st Division departed Lai Khê to reopen Route 13 to Chơn Thành Camp 30km south of An Lộc.