Yes, probably, you can defeat any opponent. Especially if you use cheats. My question was: why is the game version called "light" if only a very experienced player can complete it on almost the lowest difficulty level ("Warrior"), and even then, only with unlimited patience and incredible luck – the enemies attack me precisely when I'm in my Castle. By the way, I wouldn't be able to handle the main forces even in the Castle: 150 creatures will fly over the wall in one turn. Since I didn't see Sandro's Cloak anywhere, they would be enough... All I managed to do without completely devastating losses was to capture 2 (!) Castles. Of which, only one is fully rebuilt... And even then, as I wrote, Marbas immediately blocked my path to the Castles, which cost me all my riders and half of my furies.
Maybe I'll try it sometime on Recruit difficulty, but I suspect there won't be any difference in the Dungeon.
Besides, I was very surprised by the enemy heroes – their initiative is TWICE as high, even without any artifacts; luck and morale don't care about the Cloak of Shadows and the Ring of Broken Spirit, etc. Perhaps, after 20 years of playing HOMM, I'm still too bad of a player for this map:(