The Battle for Monistica Hill, fought September 9th, 2007 was the turning point in the Prep/Atlantian wars.
The Atlantians mobilized an army of guerrilla fighters/sappers to take the hill.
The guerrillas took the hill, and planted caltrops and various other booby traps. then after the traps were set, the Preps were lured onto the hill and decimated by the traps.
Although the Territory is still disputed, the battle was a definate Atlantian victory.