I go Galv defense early on... always.

If there's others on Defense and you can convince them to play D in Galv's room, then go in. Otherwise, I lag a little, picking off stragglers at the choke point, then I go AROUND Galv's bunker (behind it) and enter after they've started on him. The healers always end up standing in the sides, so I blow the healers up first and then drop tanks. Usually this is enough to cause their first attempt to be a fail.

I then do defense for a while and re-cap towers they hit... if O is struggling I'll go up north and head them out. Defense is a blast, though. I just play the Tower Recap game, since the alliance rarely leave enough behind to stop my shamans...