Just a refresher about wall destruction -- what, exactly, do you need to have line-of-sight to in order to destroy a wall? Is it the middle of the wall, any part of the wall, or the middle of the square in front of the wall? Please help. Thanks.

C

From the Icons rulebook, page

A ranged combat attack may be used to target and destroy a wall by drawing
a line of fire to the center of a square adjacent to the wall and on the opposite side of the wall from the attacking character; the line of fire is not blocked by
the wall.

Ooops -- page 25.