Tactical techniques for conducting battles in Heroes of Might and Magic II.

What do you think of this trick, although it's more of a glitch? I decided to spend the night in the garrison of a castle. The next day, I noticed that there were two IDENTICAL heroes in the castle (one as a guest, the other in the garrison). I left as a guest, and the garrison hero remained in the castle. Moreover, if I bought troops for the garrison hero, they also appeared for the copy. And if the army was slightly damaged in battle, the troops decreased for both the garrison hero and the copy. But the castle was always protected. And as soon as I spent the night in the garrison of another castle, another copy of my hero appeared there. So by the end of the game, he existed in multiple copies.