 Shortly after the American soldiers disembarked, a group of Spanish and Puerto Rican units began moving from Ponce to Aibonito, marching through the Carretera Central (Central Road). The caravan was composed of two companies of the Batallón de Cazadores de la Patria (Battalion of the Motherland's Hunters) and some members of the Civil Guard and a Puerto Rican guerilla force. A total of 248 infantry men and 42 members of the cavalry formed the battalions under the command of Lt. Col. Rafael Martínez Illescas, the same commander who was in charge of the Ponce garrison. Traveling by foot, the journey would last two days. The group decided to spend one night in the resort of the town of Coamo known as the Baños de Coamo before continuing their march in the morning. Martínez Illescas immediately ordered the construction of several trenches; while building these, the soldiers were ambushed by an anti-Spanish guerilla force, led by Pedro María Descartes, who managed to kill a member of the Civil Guard.
