Also upgrades allow building battleships, multi-barreled cannons, etc. A sort of uncommon invention is aeronautics. Having invented that, one can launch balloons and reveal the whole map. One of war balance peculiarities is that stone structures can be demolished only with artillery or grenadiers. Another important feature is possibility of capturing undefended enemy peasants, artillery, and some buildings.
Nations use their unique units along with units similar to other states.
Thus, within each nation a player has all military forces needed to wage land or sea war. At the same time each nation's forces are unique as for their features, abilities, and equipment. A formation includes an officer and a drummer, and units' abilities increase in a formation. The game landscape is full 3D, so it is an important strategic element. Real physics modeling also introduces many interesting issues into the game.