Okay. For a moment it sounded like there's a computer game version.
ANYway, most of the time I use German, Russian, or USA/UK forces, and less often use Japanese forces or combine Romanian forces with Germany and Canadian forces with USA/UK. I always take advantage on using indirect-fire units (only if I have spotters on the team), strong armored units with special abilities, machine gun teams, commanders, grenadiers, & snipers. I don't have any aircraft, though, so I haven't done anything for air/anti-air combat. I also haven't tried naval warfare before, and I know they have a different set of rules for that.