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If you're playing a well-designed map, it means everything is thought out. If the map creator gave a faction an army, it's because it's supposed to be that way.
Warlords seems like a standard official map for 8 players. You can play as any of them. It turns out that at the start, the computer randomly gives a huge advantage to one of the remaining factions. I wanted to find where this is specified in the map generator, but on my English Windows, all the labels in the Russian-language generator are displayed as unreadable gibberish. So I don't even know where to click.