I have an archive of the Impressions game from 1991, Great Napoleonic Battles, as well as a scan of the instruction manual. If the site administrators at Abandonia are interested, you can download these at
http://www.sabrizain.org/gnb/
I specialize in collecting war, strategy and simulation games from the late 1980s and early 1990s, and have quite a comprehensive collection of these genres, so give me a shout if you need more of these!
S