In one scene, you see a dying Mexican soldier lying on the ground after he was shot by one of the Texans, and you see blood coming out of his mouth.
A defender is shot in the head, and you see him lying on the ground, with a small amount of blood around the entry wound. In the aftermath of the battle you see blood on his head, and all around the ground next to it.
One person is sick in bed during the battle. Mexican soldiers break into his room. He shoots two pistols. Then he is stabbed over and over with bayonets. No blood shown, but you hear crunching and squishing while he is getting stabbed. His hand is then seen with blood dripping from his fingers. In the aftermath, you see his body soaked with blood.
In a flashback sequence at the beginning, you see many corpses being dragged away, and some have blood.
There isn't an excessive amount of blood, but there is some violence in an intense PG-13 level.
A soldier is sleeping, and he is bayoneted by Mexican soldiers. No blood, but you hear graphic sound effects.
In one scene, you see the Mexican soldiers marching in the snow, and you see one with frostbitten, bloody feet.
Some intense battle scenes
Mild violence
No gore (very little blood)
Some parts could be disturbing
There are men killing other men with shotguns.
Some fistfight scenes.