Originally Posted by
Combatbulter
You mean the humans forced the elves to teach them magic, which many elves regret to this very day.
The only human Kingdom the elves had an alliance with was Dalaran, they didn't really care for the rest. And this one true ally betrayed them in TfT.
This isn't entirely true, the humans needed the elves alone they had a snowball chance in hell of beating the trolls, since Quel'thalas was tanking the troll main army. They forced the elves to teach them magic and then decided to send troops in order to help beat their common enemy.