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San Felipe, San Martin sent off a trusty spy to Santiago with instructions to bring him back, on the third day, information of the movements of the enemy. He then set himself to work to prepare for battle, mounting his artillery and concentrating the different divisions. On the 10th February all the army was united on the open plain at the foot of the slope of Chacabuco.

On the 10th and 11th the engineers, protected by skirmishers, reconnoitred the roads and passes leading across the Sierra. On the 11th the spy returned, bringing answers to San Martin from his agents in the capital, and copies of the secret orders of Marcó. The spy had visited the barracks of the Royalist troops, and had counted those on the march for Chacabuco. San Martin then summoned a council of war.

The Sierra of Chacabuco rises to a height of 4,300 feet above the level of the sea. About three miles before reaching the summit, the main road from Santa Rosa to Santiago divides into two paths. That to the left, which is the shortest but also the steeper of the two, is still only a bridle-path; the other is now the main road, but was at that time little known. Both lead to the plain of Chacabuco, but the points at which they descend from the heights are nearly two miles distant one from the other. The