the ALAMO
http://www.historynet.com/battle-of-the-alamo
In the early 1820's, the Mexicans had became Independant from Spain. Then in the Mid 1830's, during december, the Mexicans and the Texans starting fighting for their own independane from Mexico. In the middle of February, 1836, is when things got really violent. And then, in March, the mexicans has won against the Texans.

After Mexico emerged victorious, the Texans decided to become Independant from Mexico.