Answer:
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. The wind is my lover, one-Βlegged am I. Name me and see me at home in the sky.
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
There are 30 cows and 28 chickens. How many didn't?
Break me and I am better immediately set and harder to be broken again.