My two coppers worth..
Clear the barricade area if you haven't already - 3 goblins near the bridge to the courtyard first, then the barricade area (moderately nasty fight, perfectly doable), then you're ready to go. Put your ranged folks up on that wooden bridge, and send one tough type like Lae'zel to tag one of the goblins from max range, and run back to the fight spot. It's a bit of a long run back, but the goblins will show up in ones and twos and threes, so pretty easy picking them off. It does confuse the game a bit, and you may see some initiative roll spam, and flickering enemies, but have patience and you'll get the bulk of the courtyard creatures. Typically a few of them never make it, so you can then head in and finish them off.
It's surprising how often running away is a really good way to start a fight.
Watch for the boulder in the barricade area, Also, the reason I suggest killing the three goblins at the table first is that there is a drum at the barricade area which will summon them.
