[PvK]

Does Abyssia have more than one commander? Looks like only one, and no missile troops. So I'm thinking the archers are on "Fire Archers" and they all immediately shoot and take out the commander, causing Abyssia to rout. Perhaps some troops of Man catch on fire as they chase into the fleeing Abyssians' heat aura.

A casting of or two of Howl on turn 1 could have a similar effect except 2-3 turns later, resulting in more troops of Man in the heat zone.

Other things could happen, though.

PvK