A THREAD FOR NEWCOMERS!

And how did the enemy hero wander around without an army? I couldn't believe my eyes when I attacked him (and, of course, won immediately).

It depends on the version, but I remember a bug where when two strong AI heroes met, one would always be killed and remain alive, but without an army... and at the same time, remained invulnerable to the AI, could sit in a castle or do something else.