In 1610, the Momotombo volcano erupted, destroying the city of León. The city was rebuilt northwest of the original, which is now known as the ruins of León Viejo. During the American Revolutionary War, Central America was subject to conflict between Britain and Spain. British navy admiral Horatio Nelson led expeditions in the Battle of San Fernando de Omoa in 1779 and on the San Juan River in 1780, the latter of which had temporary success before being abandoned due to disease.