About 150 white men and Papago Indians, who hated the Apache, stealthily crept into Camp Grant in southern Arizona territory on the night of April 30, 1871. They mercilessly slaughtered 108 men, women and children of the Arivaipa Apache tribe, who had been striving for peace with the white settlers. Of those slain, only eight were men; most of the warriors were away hunting. The killers took 29 children hostage and later sold them in Mexico as slaves. Authorities arrested the leaders of the massacre, but they were soon acquitted. The slayings influenced the policy, developed by the US president Ulysses S. Grant (1822-85), of confining the Apache to Indian reservations, where "civilization" could be instilled in them. The massacre caused the start of the Apache War of 1871-73.