One thousand humans against each other.
Yes.
Topped my record. What started off as 300 Dwarf grandmasters vs several hundred mook goblins, goblin corpses, trolls and grandmaster vampire trolls *kinda* spiraled out of control as just when one side seemed to win, another wave would be created to balance the fight and perpetuate the bloodshed.
Creatures worthy of special recommendation :
*The necromancer dogs were very entertaining, and turned the Dwarf victory of repelling the goblins on the ground level into a very fun situation.
*The were-jackal trolls were a fun one. They were all grandmasters AND were created during the full moon - so they arrived as fully armoured and armed were-jackals. They unsurprisingly tore through the entire right wing of grand master crossbowdwarves.
*The vampire Dwarf suicide squads. Fact : Being undead does not make you immune to the hatred of undead if you're on team #1 and they're on team #2. They demonstrated this well by decapitating many heads. The crowning moment of glory for these lots is when the surviving two vampires fought against each other for ages, one taking a toe from the other, the other taking a finger, before getting swamped by grandmaster hammerdwarves. The hammerdwarves got killed by attrition.
*The crossbowgoblins from the very start. They held their line valiantly, but even their superior weaponry and numbers could not best against the elite marksdwarves in their fortress.
And now for the pic!
Case and point, I don't always play arena mode. But when I do, the angels cry and puppies worldwide implode in a shower of gore.
Dwarves - 487
Goblins - 987
Trolls - 60
Dogs - 40