Let it be known I despise the assault phase with a passion that rivals an Inquisitor's hatred of heretics. It's always confusing, always leads to disputes, and always is a pain the posterior.
Nonetheless this unpleasant phase occurs in every battle.
And on occasion something exceptionally confusing occurs.
Example:
My squad of Black Templars engage in an assault against an enemy squad. Doesn't matter which side initiates said assault.
The assault ends with units still locked in assault.
If the assault continues into my opponent's turn he sometimes brings in another squad to lend his squad a hand.
But always after fighting the previous assault. So, my squad is battling the original squad. Then an addition turn of it is fought. My guys do their attacks.
Then boom: here comes the new guys and they make their hits on my guys. And because my guys already did their attacks against their previous opponents they're not allowed to strike the guys who just opportunistically jumped in. So it's essentially a free round of hits on my men who don't get to fight back.
Is this right?!?
Are you actually allowed to linger by with a squad not in the combat and then, after your opponent makes his attacks jump into it, gaining the charge bonus, and wail on the enemy and he not be able to strike back against the reinforcements because his attacks were spent on the guys he's already fighting?
Or is it consider an new assault despite it being reinforcements coming into an existing one? Can my guys then fight back against the new comers? Or do they simply suffer a round of hits they cannot answer? And if so does this mean their original target gains a new set of attacks?
See why this hand to hand nonsense maddens me? It seems some players can exploit an opportunity in an unfair way.
How do you handle these scenarios? If I had my way you wouldn't be allowed to bring a new squad in to an existing fight and gain free attacks without your opponent being able to strike back. If your intent is to reinforce a squad engaged in an existing attack the new squad should have to move into that close combat before anyone makes any fights. Not fight it first with the one and then jump in with the other.