Units are the forces you field. Each belongs to a domain (land, air, or sea) that decides where it goes and what can hit it, and each is tuned for a specific job rather than being good at everything.
Land
Infantry are cheap and flexible. Armored vehicles add mobile firepower, and tanks bring the heavy armor that anchors a ground push.
Air
Helicopters are versatile gunships that can hold position over a battle. Jets are fast strike aircraft that make attacking passes rather than loitering in place.
Sea
Warships rule the water. Heavy surface ships carry long-range guns that can even reach inland targets along the coast, while submarines hunt other vessels.
How you interact with them
You train units at your cities, then move them across the map. Idle units automatically engage the nearest enemy they can hit, so much of the skill is in the composition you build and where you commit it. A weapon that is strong against one kind of target may be weak against another, and only some units can strike aircraft, so a balanced force beats a bigger lopsided one.
Why it matters
The roster is the vocabulary of combat. Knowing which unit answers which threat, armor for armor, air to reach over a line, ships to own the water, is what turns a pile of units into a force that actually wins.
This article reflects the game in active development and will change as systems evolve.