Isendeep is the easist keep to take and largely out of the way, making it a long trip for defenders for both freeps and creeps.  Isendeep has two hotspots, one south of the main entrance and one to the southeast as the base of the Grothum waterfall.

Assaulting Isendeep requires a fairly easy trip through the cave to the CG and his two LTs.  Clear the two Coldfell NPCs near him and the roaming patrol then select an LT for the kill, offtank the CG and other LT, then kill the second LT, then finally the CG.

Most teams also frequently do the Golloval quest right after this.  Isendeep also requires reinforcement by the small campfire near the Tyrant.