Upgrades allow turning quantitative categories to qualitative, and also obtaining some new unique possibilities, units, and buildings. Science development allows increasing resource extraction efficiency, improving units, increasing artillery power and range of fire, improving towers' rate of fire and buildings' durability. 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.
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 a units' abilities increase in a formation. The game provides an unlimited variety of tactical and strategic methods of land or sea war against enemies. Thus, one can create defense in depth, carry out lingering city sieges, wage guerilla wars, deploy landing forces on enemy shores, shell an enemy with cannonballs, arrange ambushes, stake on a crowds of cheap units or create elite teams of trained soldiers with high-tech weapons, and so on.