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.
ncc1717.com 
I’m looking for a picture of System N3D counter sheet do you happen to have it?
I don’t have pictures of S7N counter sheets. All my counters are punched.
Not sure what you mean by ‘N3D’
Some of the S7N eBay listings have photos, but probably not good enough to produce quality counters. Some years ago I made counters for units which were not in the GDW sets using a spreadsheet program and a color printer.