 The 182nd Infantry continued its attack the following day, then the Japanese detonated an ammunition dump on the second hill, with one 182nd company sustaining fifty killed or wounded in the explosion.In the succeeding days, savage resistance continued in the Japanese lines around the city, and as the Americal Division grimly assaulted individual positions with tank-infantry teams and with crucial fire support from offshore Seventh Fleet destroyers, the Japanese slowly gave ground.On 13 April, previously with a plan to envelop the Japanese right flank, Gen. Arnold secretly sent his returning regiment, the 164th Infantry, into night marches twenty-five miles (40 km) to the west, well behind the Japanese lines, and with all three regiments, the 182nd and 132nd in front and the 164th from the rear attacking simultaneously, the Japanese were forced to withdraw.