Carthaginian commander Hannibal accomplishes the unthinkable by marching an army complete with war elephants over the Alps, then annihilating Roman legions in three key battles by using the terrain, intimidation and his iron will.
Julius Caesar's Roman army is outnumbered but better supplied than their Gallic enemies during the siege within a siege at Alesia in 52 B.C.
Alexander the Great faces a forced river crossing, a raging thunderstorm and a vicious enemy as he leads his army into India during his final campaign in 327 B.C.