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Without mods or exploits, this map is impossible to beat; I've tried many times. I played as the Stronghold faction, and the computer's heroes are ridiculously overpowered with stats and their army... I won't even mention Wolfenstein.
However, the map is beatable without mods (assuming mod 3.1 is installed, which we're not considering as it's essential). The goal isn't to defeat the opponent outright, but simply to survive for a certain amount of time. And all except for the last two opponents are beatable – the principle is to distract the computer with expendable units, build up your army (since you have two castles), and then defeat them. As usual, the computer lags during battles, but sometimes it combines its forces, in which case you can only lure it into your castle – that is, defend with an emphasis on attacking archers (Hagish).