Image: Sucker Punch Productions / PlayStationOfficial screenshot from Sucker Punch Productions / PlayStation.
Mongol Soldiers are the main enemy army in Ghost of Tsushima, the troops Khotun Khan uses to take the island. You fight them everywhere, and knowing their class and uniform colour tells you which stance to use and how hard they hit.
Out in the world they run road and field patrols, guard cargo carts with a loot chest, hold villagers hostage, chase refugees, camp in graveyards and brawl with bandits. Clearing a group gives a minor Legend boost. They also hold Mongol Territory: small sites you free by killing everyone, and big forts and docks with extra jobs such as burning black powder stacks, freeing falcons or taking banners.
Grey soldiers in rags are the easiest and mostly stay in Izuhara. Red ones arrive mid Act 1 and fill Toyotama. Blue ones show up late in Act 1 with helmets and nastier combos. Yellow is the bulk of the Kamiagata army and brings fire weapons. Green soldiers in Act 3 hit hardest and stagger least. Purple belongs to the Eagle Tribe on Iki and adds unique abilities.
Stay close to everyone you are fighting. If a soldier gets clear of you, he blows a horn and pulls in nearby troops. Match your stance to whoever is in front of you, and save arrows or Ghost Weapons for archers and sappers at the back.
Bandits
Bandits are the island's common criminals, attacking villagers, Mongols, ronin and Jin alike. They are a secondary enemy in Izuhara during Act 1, poorly armed and predictable, but reckless enough to hurt you.
Eagle Tribe
The Eagle Tribe is the Mongol force that has taken Iki Island, led by the shaman Ankhsar Khatun, called the Eagle. They are the main enemy of the Iki Island expansion, and their purple-uniformed troops bring units you never see on Tsushima.
Mongol Archers
Mongol Archers are the bowmen at the back of every Mongol group. They are fragile up close but chip away at you from off-screen, so kill them early or close the distance fast.
Mongol Eagle Bearers
Mongol Eagle Bearers are archers or swordsmen paired with a trained eagle that circles overhead and spots you. They fight like normal soldiers, but the bird makes sneaking up on their group much harder.