What Could 50 US Army Rangers Accomplish at the Alamo?

If you sent a 50-man detachment of US Army Rangers back in time to the siege of the Alamo, with the intention of defending it, or defeating the Mexican army, what would they be able to accomplish? In this video, I tackle that exact hypothetical question as best as I possibly can with an analysis of the arms and tactics of the time compared to the same from today. Needless to say, it's not much of a competition, but watch the video so I can explain why.
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The Battle of the Alamo (February 23 - March 6, 1836) was a pivotal event and military engagement in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna reclaimed the Alamo Mission near San Antonio de Béxar (modern-day San Antonio, Texas, United States), killing most of the occupants. Santa Anna's refusal to take prisoners during the battle inspired many Texians and Tejanos to join the Texian Army. Motivated by a desire for revenge, as well as their written desire to preserve a border open to immigration and the importation and practice of slavery, the Texians defeated the Mexican Army at the Battle of San Jacinto, on April 21, 1836, ending the rebellion in favor of the newly formed Republic of Texas.