In what war did Zachary Taylor play a prominent military role prior to becoming president?

What nickname was attribued to Zachary Taylor due to his unkempt appearance and tendency to fight alongside his men?

President Polk, in a move of jealousy towards Zachary Taylor's growing popularity, stationed the general in a vulnerable outpost in Mexico. What Mexican general, of Alamo fame, did Taylor fight off, despite being outnumbered 3-to-1?

True or False: When John Calhoun of South Carolina threatened to secede over slavery, Zachary Taylor threatened to personally lead the U.S. army against them?

Zachary Taylor was the 2nd American president to die during his term in office. Who was the first?