Sergeant Hayden's Sword

S9 E9: Four smiths will need more than luck when they are given only a small sliver of high carbon steel and a whole lot of mild steel to forge a knife. After their knives are put through a round of brutal tests, the two surviving smiths return home to recreate a sword credited with helping win a war--Sergeant William Hayden's Sword. These weapons will then face a final testing battle, where only one smith will be victorious and walk away with $10,000 and the title of Forged in Fire Champion.