If a unit with Assault takes damage that would be lethal after Assault is removed, does it die when it loses the Assault bonus?

Ruling: A unit with Assault that has marked damage less than its current Might (including Assault bonus) but equal to or exceeding its base Might will die when it loses the Assault bonus. The removal of attacker designation (which removes Assault) causes another cleanup, and during that second cleanup the unit dies due to having marked damage greater than or equal to its Might.

Sequence:

• Unit takes damage while having Assault bonus (e.g., 3 damage on a 2 Might unit with +2 Assault = 4 total Might)
• Combat ends or unit moves away from the battlefield
• Attacker designation is removed, causing Assault bonus to be lost
• The Might change triggers another cleanup
• During the second cleanup, the unit now has lethal damage (3 damage on 2 Might) and dies

Nuances:

• If the unit remains at the same battlefield and survives combat, it does NOT die when Assault drops off because units are healed during step 2c of the special cleanup, which occurs before step 2e when attacker/defender designations are removed