Does mass attack stack with more than 2 units?

[OxfordGuy3]

If you have more than 2 units next to any enemy unit, does this have an extra "mass attack" benefit over just having two?

[Kerensky]

Every valid (not AD guns) adjacent unfired (still has the red crosshair icon) unit contributes to mass attack, there is no limit.

[OxfordGuy3]

Every valid (not AD guns) adjacent unfired (still has the red crosshair icon) unit contributes to mass attack, there is no limit.

Thanks, I didn't know that, BTW What are AD guns? Do you mean AA or AT?

[Kerensky]

Air Defense.

[TheGrayMouser]

Every valid (not AD guns) adjacent unfired (still has the red crosshair icon) unit contributes to mass attack, there is no limit.

Well, the limit is 6 units around the defender hex
If you surround a unit all 6 sides the ist unit you FIRE causes a -5 initiative penalty to the defender, then -4 , -3 etc .. The last unit you fire gets no bonus (assuming the defender survives that long)

[OxfordGuy3]

Sometimes I try to hold one unit back, though, in case the attached unit retreats and would otherwise lose contact with my forces (and therefore be able to reinforce fully)...