Relic Entertainment has added a long array of military units in the Age of Empires IV. While some military units like theBattering Ram and Siege Towerare common to everyone, Others are exclusive to their respective civilization.
So, here is a list of all the military units in Age of Empires IV.
Archery Range
Stable
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Siege Workshop
Others
Remember, Civilizations like theDelhi-Sultanate, Chinese, Abbasid Dynasty, and the Holy Roman Empirecan only be played through multiplayer mode. There is no single-player campaign corresponding to these civilizations.
For more awesome guides, check out theAge of Empires IVsection on Pro Game Guides.