The Battle of San Jacinto was fought on April 21, 1836. The battle started at 4 PM and lasted approximately 18 minutes. Subsequent to the battle, Santa Anna was captured, trying to escape by wearing a simple soldier's (dragoon) uniform. Upon bringing him back to the battle site, his men immediately recognized him, stood, and saluted him. Thus, giving him away.

As a result of his capture, Santa Anna was enticed to sign The Treaty of Velasco, ending the conflict. (The issue was not being fully awake and thinking this ended all conflicts. I then remembered the Mexican-American war which occurred after this)

There is probably some truth to your story in that there was some hesitancy to accept the Treaty of Velasco due to it being signed by Santa Anna while under the duress of being a captive.

Texas was annexed by the United States in 1845. This led to the Mexican-American war from 1846 to 1848. The incident you referred to would most likely have occurred on April 21, 1847.

So, being more fully awake now, there is no issue with your story.

BTW, I celebrate the victory on April 21. I tend to overlook the "Cinco de Mayo" falderal and commemorate a different historical event that day.
--Bob

In April 1843, members of the Army of the Texas Republic found themselves facing two problems.

The first: They were imprisoned by Mexican General Santa Anna, who’d captured them during a border raid. The second? The anniversary of their victory at the Battle of San Jacinto was coming up, and the prison atmosphere wasn’t exactly set for any kind of celebration.

To pep things up, the men bribed their guards to smuggle in mezcal, sugar, eggs, and donkey’s milk. After stealing some kitchen tools, the soldiers mixed up their creamy, potent concoction. Their leader, General Thomas Green, declared the concoction a success. He later described it as “such egg-nog as never was seen or drank under the nineteenth degree of northern latitude.”

I love egg nog but I can't stop with one serving. I'm not sure I would like this concoction.