Inferno’s main forces.

Lords can be built starting from the second week, so by the third week, you'll have about 5-6 of them, which should be enough. The Castle and Stronghold for the Orcs are difficult to build because they require a lot of resources. Even if there's additional pressure, it's unlikely you'll have more than a hundred in three weeks, unless it's Haggeesh, but if you block the enemy units with gating, they won't be able to attack. And by that time, the Demons can even hire Devils. Also, we take a tent and fire arrows. The Orcs have an 8% chance of getting siege weapons, and it's doubtful they'll get them.
And we also hire Imps, so the Lords will continuously bombard with fireballs. This is a serious tactic; I fought against one Demon on a jubilee map, and I was playing as Necropolis, thinking victory was already in the bag, but he defeated me thanks to these Lords. It's a pity that there wasn't Plague at that time, but if the Demon also has Plague, then it's game over.