Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) says: We said: O Messenger of Allah, we expect to meet our enemy, and we may not have some of the equipment we need; may we eat (an animal) slaughtered with a reed? He (peace and blessings be upon him) said: "Yes, whatever makes the blood flow counts as slaughter, except a tooth and a nail."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4366