A unit of the Seventh Cavalry is on a mission over Afghanistan when their plane is hit. The thirteen men and women bail out of the crippled plane, but when they reach the ground, they are not in Afghanistan. And it seems they have descended two thousand years into the past where primitive forces fight with swords and arrows. The platoon is thrown into a battle where they must choose sides quickly or die. They are swept along in a tide of events so powerful that their courage, ingenuity and weapons are tested to the limits of their durability and strength.