Small to Huge. Armies can be up to 1000 individual units. Army sizes are restrained by resources able to produce them.
Small to medium. Infantry is deployed in squads instead of single units. "Manpower" limits usually around 100, this is adjusted by the number of territories the player controls.
Unit Types
Ground (tanks and mech infantry), Sea (ships and subs) and Air (plans and transport) units available. Many special capability units are available (shield or stealth generators), as well as the "Commander" which can be upgraded.
Ground units only (Infantry and vehicles). Infantry divides up between basic infantry which can move and shoot, and special weapons teams (machine gun, mortar, and sniper). Vehicles are scouts, armored car, and tanks.
Races
3 (4 in the expansion). Races are all humanesque, but they vary in unit abilities and strengths. For instance, the cyborg race has artillery boats that can sprout legs and walk slowly across land.
2 Races, Axis and Allies. Units have some similarities, but there are quite a few differences. The allies can build an artillery cannon that allows bombarding a large area around it, but must be fired manually. Axis gets a flak cannon that autofires.
Build Differences between races
Small. Each race builds up a resource infrastructure that allows upgrade to the next tech level (up to tech 3). Races differ slightly in what types of units are available at each tech level.
Medium/Large. Players coming from allied to axis will find a good learning curve from building dependent upgrades to "phase" dependent upgrades. Phases are upgraded at the player's HQ.
Special Abilites
Each race has it's own form of nuclear weapons and defenses against them, but the largest differences are seen in thier experimental units. Large army devasating units, some capable of building thier own armies, with large guns and heavy armor.
At the onset of battle, each player chooses a commanding strategy. This will set the special abilites that a player can enable, and they are bought with "experience" from the battle. They are sorted into Defense (infantry), Air, and Tank.
Defining Moments
Having your commander destroyed in the middle of your base. Commanders are nuclear power, and go up like a nuke when destroyed. The explosions are big, bright and satisfying.
Having your large army crippled by a V2 rocket or well placed artillery.
Game Navigation
Great! You can assign number keys to unit groupings, and using the mouse wheel, you can zoom out to a full map view, and back into any area you put your mouse over. Fog of war exists where you have no direct view or radar.
Good. You can assign number keys to unit groupings, and use a mini map to move to areas on a map quickly.
i didn't know there is a ww2 RTS, gotta check it out