Grimwood Lumber Camp is an easier outlying keep to the south.  LC can be used as a staging point to TR/EC Crossroads or a fall back point.

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.  If the freeps practice careful focus fire, LC defense should go mobile and use both entrances of the keep for cover and to try to beat the freeps at a mobile game around it.  When the freeps move to try to attack you or gain line of sight, quickly move as a mass to their rear elements which typically haven't moved yet.  Crush them quickly then get back around the walls until the freeps move at you again.  Continue until they have aggroed the main NPCs then strike.

Consider using the outpost south of LC as a staging point or as a rally point when freeps arrive to defend LC.