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This happened last night:

A group of genestealers moved into terrain THEN assaulted my marines. So here is what I'm wondering, since the genestealers were outside of the difficult terrain then went into it then assaulted...do they assault at 1 initiative? Or do they attack normally?

Did they roll to move through the difficult terrain? From my understanding of what you wrote, the answer to that is yes. And that is the requirement to drop to I1 - rolling to move through Difficult Terrain.

Yes they rolled to enter the terrain then went to assault me...I was thinking since they started their movement phase outside of terrain that they would attack at i1

Where they started any phase doesn't matter. The only thing that matters is if they rolled for the assault.

so I should have struck first then....thank you

If they were in terrain that caused a difficult terrain test when they declared the assault they would then have to roll a difficult terrain test and go at I1 barring some special rule or wargear. Whether they moved into, out of, or through difficult terrain during their movement phase has no bearing on the assault phase.

suppose if you have to roll to move in difficult terrain you would have to roll to assault as well?

Not necessarily. If the unit being assaulted is n difficult terrain or the unit assaulting still has at least 1 model in difficult terrain, you would.

Since the rules state you can't end your movement within 1 inch of an enemy model you still have to roll to assault and if you roll all 1's the assault fails. Since this test has to be made then the genestealers drop to I1.

GreyChaos wrote:Since the rules state you can't end your movement within 1 inch of an enemy model you still have to roll to assault and if you roll all 1's the assault fails.

Actually the assault still works - says so in the first block of "Assaulting through cover" on pg 36 of the BRB.

You are correct, I meant to say 2" out since you always have the 1" leeway given in an assault due to modeling and such.

If you make a difficult terrrain test when making your Assault move you strike at Init1.

It doesnt matter *why* you are rolling it, just that you have done so.