On January 20, 1839, the alliance formed Chilean Army led by Chilean General in Chief Manuel Bulnes and force of Peruvians opposed to Santa Cruz, decisively defeated the Confederate Army commanded by Santa Cruz after six hours of combat in the battlefield of Yungay, in northern Peru, 200 km north of Lima.
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Thus, Santa Cruz advanced to capture and occupy Yungay, intending to cut the Chilean supply lines and strangle the Chilean Expedition.
During the War of the Confederation he fought at the battles of Portada de Guías (1838), Chiquián, Buin, Yungay (1839), and in the capture of Lima.
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Then Bulnes commanded the Chilean army in 1838 against Gen. Santa Cruz in Peru; and, after taking Lima and winning the battles of Huaraz and Puente del Buin, combined his forces with those of Gamarra and defeated Santa Cruz at the Battle of Yungay (January 19, 1839), thus putting an end to the confederation between Peru and Bolivia.
During the War of the Confederation he fought at the battles of Portada de Guías (1838) and Yungay (1839), and in the capture of Lima.