Grimwood Lumber Camp is an easier outlying keep to the south.  There is little value except as a small staging/fall back point and a few quests.  LC has two hotspots to its southeast and southwest. 

Assaulting LC can be done from either the north or the west (staging from the south hill) entrances.  Typical fights pull all of the NPCs between the raid and the CG then pulling the CG, FM, and LT outside.  Keep it near the keep for credit and to prevent it from resetting.  If you fight the CG inside, it can be very easy to aggro more NPCs when thrown or chasing freep defenders.

Defending LC consists of being at the opposite door of the enemy then moving in when the Tyrant is pulled (or pulling it early with a pet) then trying to overwhelm the assaulting force.  Either kill the minstrels if there are few of them, kill the target of the Tyrant if it's not being kited around, or kill anything squishy to reduce the freep raid.