Second Battle of Rivas
1856 CE.
Shown on the map at 11.439°, -85.827°.
The Second Battle of Rivas occurred on 11 April 1856 between Costa Rican militia under General Juan Rafael Mora Porras and the Nicaraguan forces of American mercenary William Walker. The lesser known First Battle of Rivas took place on the 29 June 1855 between Walker's forces and the forces of the Chamorro government of Nicaragua. Among the casualties was Charles Wilkins Webber, an American journalist and explorer serving in Walker's forces, whom some scholars suggest inspired the antagonist in Cormac McCarthy's novel Blood Meridian.
Text from the Wikipedia article Second Battle of Rivas, licensed CC BY-SA 4.0.