 However, on July 23, some 150 Indians attacked a trading post on the Caloosahatchee River; it was guarded by a detachment of 23 soldiers under the command of Colonel William S. Harney.He and some soldiers escaped by the river, but the Seminoles killed most of the garrison, as well as several civilians at the post.Many blamed the "Spanish" Indians, led by Chakaika, for the attack, but others suspected Sam Jones, whose band of Mikasuki had agreed to the treaty with Macomb.