Fort Ranik (mission)

This mission can be easily solo'd if you take the healer, ranger, and mage henchmen with you (If you take the Fighter you will get adds and might get overwhelmed)

Primary
Reach the north wall, and destroy the boss there

This is pretty straight forward until you reach the catapults. These are necessary to pass some large groupings of charr that would slaughter you otherwise. The first catapult is by Siegemaster Ogmar, You need to return to him with the three spare pieces of catapult (which are located in wreckage just east of him). After all three pieces are returned, you "fire" the catapult and destroy a group of 15 or so charr.

The second catapult is already fixed, and if you fire it quickly you may be lucky and manage to kill the final boss and complete the mission. Otherwise it's a case of tempting a group of mobs out of the wall (they move into the catapults blast range if you approach the wall cautiously), being very carefull not to get within agro range, and then firing this catapult to "thin them out". Then go marching in and kill the boss. You only have to kill the boss up on the wall to win the scenario so it seems.

Bonus
Rescue "Dietmar" You can get this bonus if the leader of the soldiers you start out with survives to the first building up on the hill. Not to worry though because it doesn't seem to matter if he doesn't survive. To complete the quest, you have to rescue "Dietmar" which is something you almost naturally do as part of the main quest. He's at the end of the winding track that you follow through the first charr area.

Side Quest
For 500 extra xp, you can talk to a chap to the west of the first building up on the hill (he gets attacked as you approach) and get a really easy quest to talk to the lady outside ascalon for a quick 500xp.