Battle of Arroyo GrandeThe Battle of Arroyo Grande took place on 6 December 1842 and was a major battle of the Uruguayan Civil War.BattleAt Arroyo Grande, the federal forces, or blancos, of Manuel Oribe defeated the colorados of Fructuoso Rivera, having been in conflict with them since 1838.AftermathFollowing the battle, Oribe followed up his victory over the Colorados by marching to and besieging Montevideo thus beginning the Great Siege of Montevideo.