TIL: A hatchet is not a “bladed weapon”.
However, any variation of knife, dagger, or sword definitely is—including the Cavalry Sword—making this medal a piece of piss up until the last part. Getting 5 kills with blunt weapons isn’t difficult, just slightly more tedious than the previous steps. I don’t know if the Hatchet or Pickaxe count, so to be safe, I recommend sticking with the Club, Spiked Club, or Trench Mace. You should be able to knock this medal out in no time.