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occupation. His Spanish father had been a career officer in the colonies, 
stationed at Yapeyú on the Uruguay River, where San Martín was born. 
On his return from Europe, San Martín offered his services to the various 
governments at Buenos Aires and avoided participation in the political 
intrigue  of  the old  viceregal  capital.  He  reorganized  the  porteño  army, 
then took command of the patriot forces in the interior. In 1816, he and 
his army defeated a loyalist invasion sent across the Andes from Lima.
San  Martín  identified  Lima  as  the  key  to  securing  independence 
in South America, for the viceroy in this royalist stronghold had sent 
military  expeditions  to  put  down  rebellions in  Ecuador,  Bolivia,  and 
Chile, as well as in Argentina. Not even Argentina would be secure in 
its  newly  declared  independence  so  long  as  Spanish  forces  remained 
in  Lima.  He  decided  that  the  surest  way  to  eliminate  this  Spanish 
bastion  was  through  Chile;  therefore,  he  established  headquarters  at 
Mendoza, where San Martín trained an expeditionary army composed 
of Argentines and Chilean exiles.
The majority of his force, especially  the foot  soldiers, consisted  of 
persons of color. San Martín requisitioned slaves from the local gentry, 
giving them their freedom on condition that they fight for the cause of 
independence. Eventually, 1,500 slaves entered his army. Under his com-
mand, the blacks, mulattoes, and mestizos formed a disciplined fighting 
force and did not engage in the sort of pillage that characterized other 
military units of the period. “The best infantry soldiers we have are the 
Negroes and mulattoes,” said one of San Martín’s staff officers. “Many 
of them rose to be good non-commissioned officers” (Lynch 2009, 88). 
Exiled Chilean patriots led by Bernardo O’Higgins contributed another 
important element to this expeditionary force.
General San Martín executed a great military feat in safely leading his 
5,000 troops across the Andes Mountains. He misled the royalists as to 
his route and reassembled three columns of his troops in time to defeat 
a divided Spanish force (led by General Marcó del Pont, brother of the 
Spanish merchant exiled from Buenos Aires) at Chacabuco in February 
1817.  His  troops then  liberated  the  Chilean  capital  of  Santiago.  Two 
more battles ensued, and San Martín decisively defeated the remaining 
Spanish forces at Maipo in April. With Chile liberated and now ruled 
firmly but not ruthlessly by O’Higgins, San Martín laid the strategy for 
the next continental move. He hired a British admiral, Lord Cochrane, 
to organize a patriot navy for the expedition. San Martín formed up a 
new army, now of Chileans, Argentines, and Peruvian patriots, but was 
without a Peruvian leader of the stature of O’Higgins in Chile. Again, 
slaves  enlisted  in  his  army  and  were  subjected  to  military  discipline 
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CRISIS OF THE COLONIAL ORDER AND REVOLUTION