Final answer:
The early confrontation of the Civil War that escalated in San Antonio occurred at the Battle of the Alamo.
Step-by-step explanation:
The early confrontation of the Civil War that escalated in San Antonio occurred at the Battle of the Alamo. During this battle, army officer William Barret Travis did not completely comply with the terms of surrender. Instead, he and his troops fought valiantly against Mexican forces before ultimately being defeated.