Speak softly and carry a big stick. Riding an armored horse helps ,too.
— Game Description
The Horseman are the perfect units for attacking from medium range. If you already have some Armored Guards in the front line, you can either summon Spearmen or the Horseman, who are quicker and cause more damage.
The Horseman's weapon is a large medieval-like spear with which he attacks from a short distance. Its horse makes him fast and if you summon him while you are in problems, he will arrive quickly due to his horse. Although his health is not so high, if you dont use him in the front line, he will stay alive.
The Horseman are the first unit that has a horse.
The Horseman are the second medium range units.
The Horseman are the Fastest normal units in the game
Arthur and the Horseman may seem alike or the same, but they are very different.
The Game Description might be a reference to former President of the United States, Theodore Roosevelt's which was, 'speak softly, and carry a big stick'.