Yes,thats correct.That war was started because of due to Merlin's daughter being murdered within the land of dragons,he suspected the dragons were responsible(Which they weren't by the way).This outraged Merlin and made him order some of his best spellcasters to attack the land of dragons.Which there by started a long war.Oh and,the person who murdered Merlin's young daughter was Loch when he was just a young boy.