Battle of Arroyo Grande
Part of the Uruguayan Civil War
Portrait by Carlos Descalzo
Date 6 December 1842 Location Arroyo Grande, Entre Rios Province, Argentina Result Blanco victory
Belligerents
Blancos  Argentine Confederation	Colorados Unitarian Party
Commanders and leaders
Manuel Oribe	Fructuoso Rivera
Strength
12,000	7,500
Casualties and losses
300 killed & wounded	2,000 killed 1,400 wounded

The Battle of Arroyo Grande took place on 6 December 1842 and was a major battle of the Uruguayan Civil War.

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.

Following the battle, Oribe followed up his victory over the Colorados by marching to and besieging Montevideo thus beginning the Great Siege of Montevideo.

• (in Spanish) Arroyo Grande: una batalla sangrienta

• Origin of the Uruguayan Civil War