I think they're Ottoman Infantry and check this picture. It's old but could be accurate.
And take a look at IGN's phrase about them:
Ottoman Infantry
Ottoman Infantry are hardy soldiers, well armed and well armoured, they fight with both bows and swords, allowing them to pepper the enemy with arrows and then move into melee to finish them off. Their armour, and training in melee, also means that this unit can hold its ground against enemy units unlike most other missile units.
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