Some tips: at the beginning of the campaign use forces that interfere the infantry (the drawing of a soldier) and the cars and trucks (the second drawing) because they are the ones that appear at the beginning, in short: use on a larger scale, base guard, snipers and machine guners (soldiers and machines). Halfway start to replace by militias, assault squad, and especially AT squad because begins to appear as armored cars, light tanks and few tanks. In the final use all balanced with several anti-tank because tanks appear in abundance. Place fortress and trenches in front to protect and throw grenades respectively.
The human race has high health, but the attack caused minor damage in relation to other races. The race of Elves has high damage, but has minor health. The orcs are balanced but contains more differentiated units