Tyr

Norse god of Justice and War.
Tyr is a bit unique from not just other war gods, but the Aesir pantheon as a whole because he sees War as a means to bring about peace, and thus should avoid it until it is the only choice left. He is tasked with guarding Loki's eldest son the great wolf Fenrir. He is also the bravest of the Aesir as he was the only one willing to stick his hand in the great wolf's jaw to earn its trust. Sadly he also lost his arm in the exchange.