What pivotal event in the Texas Revolution involved a siege where all Texan defenders were killed?

The correct answer is the Battle of the Alamo, which is one of the most significant events in the Texas Revolution. This event took place in 1836 when a small group of Texan defenders fortified themselves in the Alamo mission complex, located in San Antonio. The siege by the Mexican army lasted for about 13 days, culminating in a fierce battle on March 6, 1836. Unfortunately, all the Texan defenders, numbering around 180, were killed during the assault. The bravery and sacrifice displayed by the Texans at the Alamo became a rallying cry for Texan independence, symbolizing their fight against oppression and motivating many to join the cause.

In contrast, the other options represent different events in the Texas Revolution. The Battle of San Jacinto was a decisive victory for Texas that ultimately secured its independence from Mexico. The Battle of Goliad refers to a separate conflict where Texan forces initially captured the presidio, but it is more associated with the massacre of Texan captives afterward rather than a siege. The Siege of Bexar involved Texans laying siege to Mexican forces but did not result in the same level of martyrdom as the Alamo. Each of these events played a role in the broader