On heroism at the fall of Acre (Akko), I believe that the last of the christians to hold out were one of the fighting orders (Templars, I believe, or Hospitallers) who fought on after the walls of the city had been breached. They holed themselves up in their fortress/convent when everyone else left and refused surrender terms (although I beleive one Muslim source says that they were offered terms but the Muslims then took them back when the knights abused some prisoners). Eventually, their fortress was undermined and collapsed, and all the knights died in the final defense.