LITTLETON — The Arapahoe student section was hitting the Heritage student section with the “LITTLE SISTER” chant all game Friday night at Littleton Public Schools Stadium in the latest rendition of the Battle for the Brookfield trophy. And after a closely contested first half, Arapahoe’s tight defense and acquisition of game-changing turnovers enabled the chant to stick, as the Class 5A Warriors defeated 4A Heritage 28-13 for their third straight win over their crosstown rival and seventh victory in the last eight Milk Jug games. “We left a lot of points out here tonight, and they probably think the same thing,” Arapahoe coach Mike Campbell said.