Injured baby sparrow. (broken leg + wound)?

I think that if you can't find an animal hospital, or anywhere that the baby might be able to get help, that you should let him be. I know it'll be hard, but if you really cant find anywhere for him, that's what you're going to have to do.. It's very nice of you to try to help him, but I know first hand from trying to help wild animals, that sometimes things don't go as planned.. I've tried to rescue baby birds too, but sometimes when I get close to them, they become frightened and fly away, getting themselves lost and unable to be helped.. So overall, find a place where they can repair his leg, or let nature take it's course. I hope I could help you a little, and good luck with the little guy..(: