Between iceblood graveyard and iceblood tower. You'll get wrecked if you're alone after they kill galv though, so you may want to go straight to stonehearth to cap the gy and kill balinda, then fall back and recap iceblood tower, graveyard, and towerpoint. Holding these three close proximity flags will almost always guarantee you at the very least a reinforcements win. Watch out for mass spawns from snowfall though, sometimes you'll get a wave of 15+. If you have even just a few decent geared tanks and healers on offense they'll be able to down Van before alliance realizes they have 2 marshals for their own healers to deal with on Drek and their ezmode rush was just countered by a boxer holding 2 towers.

These are mostly going to be long drawn out games though. It's extremely lame how skewed in favor the map is towards alliance. Horde can't just ezmode rush Drek while watching a movie and eating chinese food for wins. You'll never win the rush against alliance unless your 40 outgears and outplays their 40 by a long shot.