Lose and pay 2500, buy a book for another 2500, buy elves for, say, 2000. Where was he going to get that much money when money is the rarest resource on this map, and elves and dendroids are built in the castle with difficulty?:) And why didn't he just buy a cheap unit in the castle and transfer those same elves, even without a magic book, if he had that much money? In general, there are many questions about your phrase "...and calmly attack and kill the opponent...":cool:
In short, to avoid arguing, I looked at the save. Uran has 1600 money in that turn and a chest worth 1000 available. Some fantasies about ransom, etc.