Mexico claimed the Nueces River was the border between Texas and Mexico. The US claimed the Rio Grande was the border. The "Disputed Area" in between was claimed by both countries.
General Zachary Taylor and General Winfield Scott- leaders of the Mexican War
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