Ameliorate the Alamo

Directions:  grammatically correct the sentences below, in red. There are two missing commas and two missing periods.
The 1836 Battle of the Alamo was a pivotal event in the Texas Revolution following a thirteen day siege Mexican troops launched an assault on the Alamo Mission, killing all of the Texan defenders

Suggested Answer:
The 1836 Battle of the Alamo was a pivotal event in the Texas Revolution. Following a thirteen day siege, Mexican troops launched an assault on the Alamo Mission, killing all of the Texan defenders.

Video: Texas War of Independence 3 minute video  STOP video at 3:10. After that, the video gets into preaching of religion,
VIDEO #2