[Rules] (Rules) Section of Assault

[richvalle]

Is that so? We've always played that units entering the hex can trigger an assault.

All I see in 4th ed rules are:

"This initiates an assault (or reinforces an existing one)."

Ahh, found it.

12.3 Voluntary Combat
If an activated unit enters a hex which was already occupied by friendly and enemy units at the start of the moving unit's action segment, or if the turn begins with both sides' units in an assault hex, then the active player may choose whether or not to attack with those units this turn. If he attacks, any units that moved into the hex this turn, plus any undemoralized friendly units and leaders that began the turn in the assault hex and have not activated this turn, may attack if desired. Not all units must attack. However, all enemy units in the hex defend as one combined strength.