Oy, <name>! I think I might have a solution te that pesky barrier keepin ye out of Corlain proper!
I took the silver we had left 'ere an' doctored up one o' these cannonballs. The walls surroundin' Corlain are festooned with defensive cannons. Get one pointed at the gate, ye can send this beauty right into the barrier!
Ye'll need a hefty pinch of powder te get this thing movin', though - it's a bit on the heavy side. Ye can likely find some in the camp outside the walls.