I put on a Sledghammer Suit (from Super Mario Bros. 3) and throw hammers at your Chain Chomps, taking them out easily. I then throw one at you that knocks you from the hill.
I set up a wall of fire that surrounds the hill. Just past that is a fifty-meter wide pit filled with poison-tipped spikes, and on the other side of that is a ring of whirling blades. And I stand at the top of the hill with a fully-loaded .44 Magnum and plenty of extra ammo.