Can Water Magic Be Used in World Conquests?

If water magic was that dramatic, it would already be involved in world conquests. I don'tknow exactly how wind works, cause i keep forgetting to look it up and understand it, but, you know, it could be useful sailing at sea. It's not clearto me what changes the temperature over there so quickly that i get 60 mile an hour winds. All right. A dragons, man flapping. Yes. Et there be dragons, or here de dragons. And therter their cheating eyesight will help see through any rain or whatever. Riht, it's probably not going to help thim much with the dragons. Maybe make their flying cut the conditions a little