A political cartoon from 1846. It is mocking the fact that the majority of the volunteers to fight in the war were untrained civilians. Only one is actually dressed in a military uniform. Notice even the uniformed soldier is holding an umbrella instead of a gun.
Famous Texas Rangers Ben McCulloch, John "Rip" Ford & John Coffee Hays, fought in the Mexican War
Texas Rangers "The Texas Devils," served as scouts.
General Winfield Scott's amphibious landing at Vera Cruz