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When France invaded Spain, San Martin fought against them on several occasions, eventually rising ro the rank of Adjutant-General.
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San Martin was given the task of organizing a corps of grenaiders against the spanish royalists centered in Peru who threatened the revolutionary government in Argentina.
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In 1812, San Martin switched to fighting against spain, and sailed to Buenos Aires.
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San Martin was appointed givernor attendant of the province of Cuyo, the capital of Mendoza, the key to the route across the Andes.
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San Martin entered Caracas and was welcomed as a Liberator with new amounts of control.
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In January, San Martin defeated a small Spanish force that had been harassing settlements on the Parana River.
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San Martin took control after Belgrano was defeated at the Battle of Ayahuma.
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in a supreme feat of generalship, San Martin let his 5,000 troops over high Andean passes to Chile, gathered them together again and fell upon the Spanish forces, defeating them Chacabuco.
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San Martin fought his way Westward across the barrier of the Andes, which cause the Spanish commander to divide his forces in order to guard all possible routes.
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San Martin sought reinforcements from Bolivar, whom he met in Guayaquil because his army was weak and full of disease.
