Deadliest Warrior: Armies
Why not do elite armies? The "special weapon" can be the leader of the army.
Spartan Spartiates vs Tiger Guard of 3 Kingdoms China
Leader- Lysander (excellent tactician who defeated Athens. Excelled at land and naval warfare)
Weapons- same as show
Leader- Dian Wei (intimidating bodyguard of Prime Minister Tsoa Tsoa. Known for fighting with two 100 pound halberds)
Weapons: Halberds, long sword, spear, and crossbow
Next: Alexander the Great's Argyraspides (silver shields) vs. Genghis Khan's Cavalry Archers
Leader- Alexander (one of the greatest conquerors of all time. His army defeated infantry, cavalry, chariots, and elephants; as well as, being excellent at seige warfare and guerrilla warfare. Arguably the most versatile, adaptative army in the world.)
Weapons: Sarissa (18 ft spear), 8 ft spear, short sword, javelin, and shield.
Armour: Silver shield, silver armour, helmet, and greaves.
Leader- Genghis Khan (Great conqueror. Unified dozens of Mongol clans. Known for his battlefield prowess and ability to spot talent. His army defeated the Northen Chinese, Imperial Chinese, Middle Eastern countries, and portions of Europe. The world's greatest cavalry archers)
Weapons: Mogolian Bow (over 100lb test), scimitar, axe, lance, and horse.
Armour: boiled leather with underlying iron, chain mail, and special silk shirt.
There are dozens more elite units that could battle such as: Templars, The Immortals, Xenophon's 10,000 Greeks Mercenaries, Shingen Takeda's Samurai cavalry, ...etc