Inquisition Daemonhunt mod for Dark Crusade.
Expert Skirmish AI on a huge map, I took on their army head on as they attempted to invade my base, I was fighting the Chaos Marines, their army consisted of about 8 platoons of Chaos Space Marines, god knows how many walkers and about 3 squads of those big ass soldiers who's names I can't remember.
My army amounted to one Grey Knight Terminator squad, my Grey Knight hero, four or five squads of regular Grey Knights and a Land Raider.
All my squads were reinforced to the max and upgraded with psy-bolters and meltguns, my hero linked to my Terminator squad, my Knights stood in a perfect line against the Chaos forces with that sense of unwavering dedication, faith and badassery that makes the Knights so awesome, forward they charged, taking down wave after wave of Chaos Marines as I frantically attempted to reinforce them as they fell in battle.
20 or so minutes later, the battle still continues, my resources nearly depleted with all the reinforcing I'd been doing, my Land Radier had been all but wiped out, my hero was almost dead, I had three terminators left out of my initial squad and two squads of regular Knights with their Justicars alive. Just.
Final wave of Chaos Marines trots along and I don't think I'm going to make it, last ditch effort as my base had been all but obliterated and my knights + raider just gun down everything in sight with such little effort, due to the fact that they'd hit Veteran status by that point for taking down so many enemies beforehand.
The remainder of my forces then went on to mop up the Chaos base, as the AI had expended all its resources on that mass battle, cleared it all up with little resistance.
Final tally? Grey Knights left standing: 11. Chaos Space Marines: 0.
Long live the fucking Inquisition.