Recently, I was in a battle where one of my units had already assaulted an independent character and they had piled in at the end of the assault phase, surrounding the IC. However, due to the shape of the terrain I couldn't properly place the models in a decent circle around the IC with a decent-sized gap so I placed them round as best as possible. In the next assault phase it was discovered that the base of my IC that wanted to assault was slightly wider than the gap I was able to leave.
If the units would have been placed on flat terrain there would have been ample room for my IC to assault.
In this situation, would my IC be able to assault or would the physical placement of my first unit prohibit the assault?
I have done a rough sketch though my scales have something to be desired:
Basically, #2 in the unit was on the terrain and #4 and #5 were as close to the other piece of terrain as possible. The terrain was not classed as impassable but the physical shape prevented me from standing the models on the terrain.
We did a 4+ to determine whether it was possible after much discrepancy but I'd like to know what others think.
If the units would have been placed on flat terrain there would have been ample room for my IC to assault.
In this situation, would my IC be able to assault or would the physical placement of my first unit prohibit the assault?
I have done a rough sketch though my scales have something to be desired:

Basically, #2 in the unit was on the terrain and #4 and #5 were as close to the other piece of terrain as possible. The terrain was not classed as impassable but the physical shape prevented me from standing the models on the terrain.
We did a 4+ to determine whether it was possible after much discrepancy but I'd like to know what others think.