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Why is this = ? Because after the battle, the attacker refused to continue the game and surrendered? Didn't see any prospects? But another player might have seen them, built a new army, or acquired more magic and perhaps won... but he made that decision himself. Or maybe there really were no prospects... Well, he should have thought about it before attacking. Who could have predicted that? Maybe no one - that's just how it is. Bad luck, it happens...
The answer to your question was already given by the attacker.
He was stingy and attacked - now there's no army at home and no money either. Sad :(