System 7 Napoleonics by GDW. By this stage (1988) most of the rules had been replaced with house rules. This would have been a 1813 scenario. Prussians (infantry mostly in square) defend against a French attack. Freiwillige squadrons can be seen attached to some Prussian cavalry regiments.
An earlier game using the GDW rules as written (about 1980).
A conversion of the GDW rules for the Roman period, ~50 BCE to 100 CE.