Auto-translated
My most epic battle was in the Warlords of the Horde campaign. I was assaulting an Orc Castle that had around 400 Cyclops. Of course, I saved before the assault, especially since taking this Castle wasn't mandatory.
I quickly eliminated the Goblins so the Cyclops wouldn't throw them. The Cyclops attacked and got stuck right in the gate. I cast Blindness on them, and no one could leave the city until my under-leveled catapult created a breach in the wall. But by that time, not many could leave. Under the effects of Mind Control and Berserk, the enemies killed many of their own.
When only Cyclops and a large group of controlled units remained, I blocked the Cyclops' path with an Avatar (a very strong unit with incorporeality - summoned like a Phoenix) and a Phoenix. The Cyclops killed them, and I summoned them again. All the while, the controlled units were attacking the Cyclops from behind. The Cyclops didn't reach my troops.
This isn't the first time enemies have gotten stuck right in the gate. Very recently, while assaulting the last Castle in the 2nd mission of the 3rd campaign of the original game, a weak unit got stuck in the gate. This allowed a hundred of my Knight of Isabel to eliminate this unit and break into the Castle. Thanks to this, 65 enemy Titans quickly died. The Knights also died, even though Archangels resurrected many of them. But I still had 50 Archangels, 650 Adepts, and a legion of Archers. And everything else in the appropriate quantities. I had Archers because my Godric had a Unicorn Horn Bow. Otherwise, I would have had Rangers. When a hero is about to assault a Castle, I train Monks instead of Knights.
I was playing version 3.0. I created such armies because I wanted to get all the Dark magic spells for Markel from the Mages at any cost. In the end, I succeeded.