My apologies if this has been asked before, I didn't find it with my first two searches.
Recently some friends of mine were playing a game of Dark Eldar vs. Tau, and they had an argument for over an hour about assaulting through the walls of a ruin. Since they still haven't resolved their dispute, I turn to you, oh mighty Interwebs, for the answers I need.
This is the setup: A unit of Dark Eldar are hiding in a ruin, with two solid walls on the building, with the ruin declared as difficult terrain. A unit of Tau are on the other side of this seemingly solid wall. Neither unit has LOS to any model in the other unit.
On their turn, the Tau are unable to shoot at the Dark Eldar, with the DE player and his friend declaring that shooting uses TLOS. On their turn, the DE assault through the wall at the Tau, declaring that Assault Movement does not use TLOS, and this is therefore legal.
Reading the assault rules I think the correct answer is the DE must make a dangerous terrain test for assaulting through difficult terrain, then move around the wall since there was no 1 inch gap in the wall for them to move through. Am I correct in this?