What town did Haden and Benjamin Edwards want to take over?

Nacogdoches, Texas.

After Mexico got its independence from Spain in the 1820's, it found that huge parts of its northern territory were sparsely populated. So a law was passed that would allow Americans to immigrate and colonize these lands in what is now Texas. Certain Americans, like Haden Edwards, were hired as "empresariOS", who would act sort of like special governors to rule over the colonies for Mexico.

The problem was, long story short, that Edwards was kind of a jerk, and treated the people there like crap. When the people complained to the Mexican government, the government rescinded Edwards's license, effectively firing him. Edwards ignored the firing and continued to rule; eventually he started a rebellion, and renamed Nacogdoches "Fredonia".

However, "Fredonia" didn't last long- a little over a month. The Mexican government sent an army to end the rebellion, and Edwards and his small band of rebels eventually fled back to the United States, where they stayed until the Texas Revolution started in 1836.