You start the map with a force of War Elephants, Elephant Archers, Legions, a Scout, and the three objective-connected Elephant units (Hannibal and the Armored Elephants). There are four units you should keep out of harm's way at all costs: the Scout, to provide Line of Sight, and the three Elephants, because you might have to run past the towers at the end, which will be a lot easier if they're at full Hit Points. There are two ways south: one short, past a row of towers, and one longer, with no opposition. The eastern path, with no opposition, will be easier.