 In the first battle, the Korean infantry division lost heavily, and General Yang Heon-su concluded that only a large cavalry division could stand up to French firepower.An ambush, by Korean forces, of a French party attempting to occupy the strategically important Cheondeung Temple, on the island's south coast, resulted in the French retreating, and abandoning the island.In 1871, following the General Sherman Incident, the United States Navy launched an expedition against the soldiers at Ganghwa Island, resulting in the Battle of Ganghwa.