The Swordsman is one of the first enemies introduced in the first iteration of the game, along with the marksman.
The Swordsmen is similar with the footmen in appearance and strengths, but can be distinguished by their weapon, as the swordsmen wield swords while the footmen wield spears. Most soldier acts as a troop leader and placed in the frontline. The most they can do against your machine is slow it down in large crowds and having the bodies get stuck in the wheels or cogs of your contraption.
Sometimes, players can see that there are strange patterns on the Swordsman. However, this is not a strange pattern. It is merely the reflection of the swordsman. This can be evidenced by stopping the simulation and watch the sword as if it's a mirror.