I had the first Castle. Back then, I just got a Pentium 2. We started playing, and everything was fine; we were killing neutral creatures, and we didn't even realize what was going on. But then I came across neutral creatures that could shoot (evil eyes), and before that, I was just lucky, and all the non-shooting ones appeared. But then those ones made us lose! There was also an Underground passage. The game was 1v1. So, in the middle of the map, there was a Border Guard. We visited the tent and got as many as 3 Angels! We opened the passage, and then a lord jumped out from there, and he had 10 Black Dragons! He completely crushed us!))) And the funniest thing was that on the first day of the game, I spent all my money on heroes because I didn't know that I needed to reload the turns (I was 7 years old) and thought that the hero was no longer usable... But in general, since then, I've been a fan of the third game, even though I've played all the parts of Heroes, Disciples, and Warcraft; I still come back to the third game!!!

Added 1 minute ago
And the first hero, and still my favorite from that Castle, is Valeska, with her archers specialization