Nps JT
It appears that I entirely missed that the unit was destroyed and not routed
. I'd say that in that circumstance the Brigadier is removed from play. Whether he is captured, killed or has miraculously escaped to fight another day is up to you but he has no more impact on the current battle.
If playing in a campaign with prisoner exchange, then perhaps a D6 roll might be in order. 1-2 dead, 3-4 captured, 5-6 escaped?