March 6, 1836. The Alamo. The victory that cost Mexico half its territory.

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1. This is the battle that changed everything:

The Battle of San Jacinto (Spanish: Batalla de San Jacinto), fought on April 21, 1836, in present-day Harris County, Texas, was the decisive battle of the Texas Revolution. ... Sam Houston became a national celebrity, and the Texans' rallying cries from events of the war, "Remember the Alamo!" and "Remember Goliad!" Lulled into overconfidence by his initial easy victories, Santa Anna was taken by surprise at San Jacinto, and his army was annihilated on April 21, 1836. The battle only lasted 18 minutes. The captured Santa Anna, fearing execution, willingly signed an order calling for all Mexican troops to withdraw. Texas became an independent republic.