I fancied learning a song that begins

"All the young men are going for soldiers"

but I can't find it anywhere, & can't remember any more than the first line. I've heard it many times & I'm sure it's well-known, but I can't find it anywhere. Presumably I'm muddling the lyrics somehow. (Is it "All the young boys"? "All of the boys"? "Going for sailors"? "Have gone for a soldier"?) Help!