Jebus Cross

Vigo (red, Stronghold, Crag Hack, Crag Hack) def Pit (blue, Castle, Valeska, Gretchin) 126
First few turns didn't fight anyone, just no one to fight, wolves not built, roads are fast, money is there. Crag fought his first battles on 114, took a couple of Dwarf Cottages off-road and leveled up Tactics, a useful thing. I see an external dwelling of birds guarded by up to 99 Magogs, will take it. The decisive turn was 117, not only did I level up to fight up to 99 dogs, but also up to 19 Fanatics gave an external dwelling of bears, and the scout hero broke through the Magogs and managed to claim the external dwelling of birds. Bears into castles and two pleasant external dwellings.
On 122 Crag takes an experience Pandora and gets Logistics as his fifth skill. On 123 I take a no-magic box with 3 Angels. Then we saved, finished a couple of days later, loaded back and a streak of bad luck started :( , first I was distracted by the scout hero chasing a pile of gold, and Crag had to go back 4 tiles for the army, then he didn't move for half a turn on 125, which was right before entering the treasury. As a result, Gretchin took my Pandoras - 3 Titans and trees (three trees, in the end he has 35 Wyverns total!).
On 126 I enter the treasury, and there's Gretchin with up to 99 Wyverns, Titans, ARCHANGELS, AND ANGELS. I take the risk and attack.
Crag level 18, 24 23 13 13 (expert Earth, Tactics, Armorer, artifacts for morale and luck, Sphere of Permanence), 6 Angels, 1+1+14 Thunderbirds, 6 Ancient Behemoths, 35 Orc Chiefs (from Pandora) and 26 regular Orcs
Gretchin level 21, 25 5 4 4 (55 mana, expert Earth, Armorer, with Shackles of War, Cape of Silence for all fifth-level spells), 6 Archangels, 6 Angels, 35 Wyverns, 3 Titans

I deployed and deployed, but made a blunder and he struck at the Behemoths, then also hit them with Angels, leaving only 3 of them. But before they died, that part with luck took down 3 Archangels! By the second round, he had one Archangel with 2 health left, 3 Angels, accelerated 35 Wyverns, and Titans. Then, miraculously, I killed the Wyverns, the Archangel, the Angels, and it was 3 Titans against 2 half-dead Angels, 35 Orc Chiefs, and 6 Thunderbirds. Gretchin tried to flee, but the Shackles are strong, and the Titans died quickly.

Phew! Finally took down the monster!
Thanks for the interesting game, Petruccio!