If Big Convoy brings any 18th+ century technology, such as gunpowder, napalm, or cybertronic tech, (laser pistols) the spartans are going to be blown to pieces. Plus I doubt that any human powered melee weapon can even scratch cybertronic metals...
(That movie was a joke. It had moments till it was believable, but after the "push the wall of the deads on the enemy" it was a joke... (example: of course the ramming rhyno stops at the feet of the spartans...

))