 On August 9, 1898, American troops that were pursuing units retreating from Coamo encountered heavy resistance in Aibonito and retreated after six of their soldiers were injured. They returned three days later, reinforced with artillery units and attempted a surprise attack. In the subsequent crossfire, confused soldiers reported seeing Spanish reinforcements nearby and five American officers were gravely injured, which prompted a retreat order. All military actions in Puerto Rico were suspended on August 13, after U.S. President William McKinley and French Ambassador Jules Cambon, acting on behalf of the Spanish government, signed an armistice whereby Spain relinquished its sovereignty over the territories of Puerto Rico, Cuba, the Philippines and Guam.
