You might be able to hit the broadside of a barn, but your aim is not sufficient for anything more than a general area.  You don't want to alert the goblin to your presence so you are just going to have to deal with him the old fashioned way.  Under cover of midnight you slink around to the edge of the camp and work your way along the side until you are close.  Despite your apparent lack of skill in fighting and archery you are an absolute master at sneakery.  But enough of such destracting thoughts.  As the goblin turns away you leap forth, cup his mouth with your left hand, and stab him through the back.  You pull the body away from the camp so none of the other goblins will see it.

 
Fortunately for you, none of the goblins seem stirred in the least.  You removed that problem without attracting attention.  Even better, another one of the nightwatchmen goblins has come back to the same post trying to figure out why his comrade is no longer at his post.  This affords you the opportunity to repeat the procedure and return once again.  The way to the central tent still has a few more problems in store for you.  Single goblins patrol the area and there is always at least one patrol goblin within sight range of that tent.  Also, the tent itself has its own nightwatchman who is evidently dedicated to the shaman.  At the very least, you need to kill one of the patrolling goblins to create an opening and the sentry guarding the tent.  With this done, you have a chance at abducting and interrogating the shaman for some much needed information on the Craxil.

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
You have some ideas on the patrolling goblin.  You could attempt to construct a simple foothold trap out of vine and add some barbs from the camp to dig into his foot.  Alternatively, you could wait until he rounds his usual tree and cut him down before the next patrolling goblin comes along.

You wait Behind The Tree And Cut Him Down As He Comes Along

You prefer to keep things simple and avoid the convoluted.  Besides, a barbed trap would likely make him scream out before you kill him would it not?  You hide behind a tree and wait for the next goblin to make his usual round.  As he comes about you plunge your sword into his chest and immediately grab him so you can hide the body before the next patrol arrives. 

 
You wait for the opening to come again, then quickly maneuver into position to stab the tent's sentry before the next patrol goblin comes around.  You peek inside to see the shaman sleeping (lucky you) and drag the sentry's body inside where it won't be detected.  You've reached the shaman, and he's still asleep, but you can't very well interrogate him here.  You pick up a candlestick from the nearby table and as he's coming to you clock him over the head with it.  You check for a pulse to see if he's dead or unconcious and thankfully, he's just knocked out.  You gag him and bind his arms behind his back because he won't be able to cast spells without his tounge and hand movements.  You use the same patrol opening to escape the camp and return to a spot distant from the camp.  You rouse the shaman to wake up and realize you are probably more scared than he will be.