The Mexican General Martín Perfecto de Cos (1800–1854) was in command of a portion of the Mexican army during the Texas Revolution of 1835-1836. Married to Lucinda Lopez de Santa Anna, Cos was the brother-in-law of dictator and army commander, Antonio Lopez de Santa Anna. Cos commanded a wing of the Mexican army that besieged The Alamo on March 6, 1836; his men eventually overran the defenders of The Alamo's north wall. After the fall of The Alamo, Santa Anna divided his forces, and Cos and his 500 men reached San Jacinto on the day of the battle; he was taken prisoner three days later.
Cos had been named the Mexican commander during the initial rebellion in 1835, but his forces were trapped in San Antonio by Texian troops led by Stephen F. Austin. After a nearly two-month siege, Cos surrendered the city but was allowed to leave with his troops, meeting up with forces led by Santa Anna. Cos later commanded a garrison of troops in the Mexican-American War but saw no significant action.