Crockett was very public about heading to TEXAS to fight for their independence. There were many portraits of him at the time. He was also a member of Congress for Tennessee. Or maybe just the coonskin cap? Santa Ana knew who he was fighting at the Alamo. How so, I have no idea.
In most battles before the 1960s they had no idea who they had killed or captured until much later. Sometimes not until the war was over in fact.
I was being sarcastic. I don’t think they had any idea who these people were. I don’t think Americans leaders had their portraits up in Mexico at that time.
Would you recognize any Mexican leaders, or most any leaders of any country, you crossed paths with and we have the internet and mass communication?