The Battle of Arroyo Grande took place on 6 December 1842 and was a major battle of the Uruguayan Civil War.
== Battle == At Arroyo Grande, the federal forces, or blancos, of Manuel Oribe defeated the colorados of Fructuoso Rivera, having been in conflict with them since 1838.
== Aftermath == Following the battle, Oribe followed up his victory over the Colorados by marching to and besieging Montevideo thus beginning the Great Siege of Montevideo.
== External links == (in Spanish) Arroyo Grande: una batalla sangrienta
== See also == Origin of the Uruguayan Civil War
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