And with that, the plan unfolds.
Even though the goblins are expecting you, by keeping Heirmund back with the light and moving quietly, they are caught unprepared for your attack. Thus you are able to gain a few precious seconds before they can react.
((Your Move Silently roll: 18. Lowest mod (Jair): +1-3=16. Goblins' Listen check: 12.))
First Jerek and Lehko step into the room, allowing them to attack the goblins at range without their other party members getting in the way. They quickly notice a problem: very little of the light manages to wrap around the corner and cross the barrier to the goblins, which results in Lehko's sling shot clattering against the barricade. Jerek manages to compensate better however, and his shot takes a goblin right through the throat before they even know you're there.
((Lehko's attack: 8+2-4=6. Jerek's attack: 19+4-4=19. Concealment check: 25%. Damage: 5+3+1=9.))
Then the rest of the party charges. Only Kuma and Terrek are fast enough to have a chance to jump the barricade before the goblins can react--and Kuma gets there first. Sailing over the barricade cleanly, he lands over the fallen goblin's corpse. To the goblins it must almost seem as if their companion had suddenly transformed into a powerful enemy!
((Kuma's jump check: 12+7-3=16.))
Seeing that the plan has gone off without a hitch, Heirmund hurries forward with the lantern, bathing the room in its light once more and negating the concealment the dimness gave the goblins. Meepo approaches with Heirmund as well, weapon drawn, now that he sees battle is joined.
((Ydyr, Jair, and Terrek end their movement each facing one of the remaining goblins, Kuma on the far side in between two of the goblins. Lehko and Jerek stand at the rear with ranged weapons, Heirmund and Meepo behind them.))
((Initiative: Terrek 21, Kuma 20, Goblins 20, Lehko 17, Jair 15, Meepo 14, Heirmund 12, Jerek 6, Ydyr 3.))
Terrek immediately attacks the goblin facing him on the other side of the barricade, but misses, despite the fact that the goblins are still surprised. Kuma brings his sword around in a mighty arc, literally cutting a goblin in two from shoulder to waist! --This causes his swing to lose momentum however, so that he can't quite carry it through to the other goblin facing him.
((Terrek's attack: 5+3-4=4. Kuma's attack: 20+3=23. Confirm: 19+3=22. Damage: 2+3+8+3=16. Cleave: 1+3=4.))
The remaining two goblins recover quickly, and amid much yelling, scrambling, and confusion, they--retreat. One withdraws through the door to the north and down the hall Lehko observed, while the other retreats through the door leading west. Both are gone from view in moments, although they haven't gotten far; you can still hear them yelling for help as they go.