Speaking of wights and ghols and stuff, here's two things it took me a while
to learn on desert. Y'all probably know this, but what the heck.

1) Escort wights. A little thrall circle seems to work OK (are there better
ways?). This prevents ghols popping yer wights.

2) Block the bridge early to block the enemy ghol rush. Make sure you don't
leave room at the edges/shallows for ghols to sneak around! If archers and
other forces start threatening your blockers, of course you move them
back... it's just an early-game prevention thingy.