The Battle of Chacabuco
Brigadier Maroto attempted to block San Martin's advance on Santiago at Chacabuco Farm. San Martin was obliged to attack before Royalist reinforcements arrived. His main column under General Soler was sent around the Royalist left flank, but was delayed, and it was left to the holding force under O'Higgins to attack the Royalist position. The Royalist line was broken, and the flank march arrived to complete the victory.
Republicans
Commander: General de San Martin
1st Division (General Soler) - 2,000 men
11th Infantry Battalion
Cazadores de Los Andes
Amalgamated Battalion (Grenadier and Cazador companies of 7th and 8th Infantry Battalions)
One Squadron of Horse Grenadiers
Escort Squadron
7 guns
2nd Division (General Bernardo O'Higgins) - 1,300 men
7th Infantry Battalion (Centre companies only)
8th Infantry Battalion (Centre companies only)
Three Squadrons of Horse Grenadiers
2 guns
Total: 3,300 men with 9 guns
Royalists
Commander: Brigadier Maroto
Battalion 'Valdivia' (c.600 men)
Battalion 'Talavera' (c.600 men)
Battalion 'Chiloe' (two companies only, c.200 men)
Two squadrons 'Carabineros de Abascal'
One company of Hussars de la Concordia (50 men)
2 guns (4pdr) (20 men)
Total: 1,400 infantry, plus cavalry and 2 guns