What Was That Saying?

What was that saying? Something like, "for want of a nail, the empire was lost."

I'm all ready to make some late-night blueberry mini-muffins; preheated the oven, sprayed the tin with PAM, found an egg, mixing bowl. But I can't find a can opener to use to open the can of blueberries.

But I'll prevail. I WILL find a can opener. Or I'll chew through the can with my teeth. Just joking, my teeth are in no condition to gnaw through metal.