Backswordmen

Plural of backswordman; soldiers or fencers who fought with backswords, swords with a cutting edge on one side only.

From 'back' (Old English bæc) + 'sword' (Old English sweord) + 'men' (Old English menn). The backsword was a practical military weapon distinct from the double-edged longsword, becoming particularly popular in 17th-century England.