Another game in that series, published in Strategy & Tactics magazine #149, February 1992. Errata was published in S&T #159.
From the introduction :
"Franco-Prussian War is a simulation of the Franco-Prussian War of 1870-71. One player assumes the role of the German high command, the other the French. The German objective is to defeat France, thereby unifying the various German states into a single nation. The French player's objective is, initially, to gain glory for the French Empire; failing that, it is to successfully defend France against a German invasion. Franco-Prussian War uses a new system to simulate the nature of 19th century warfare. The game system itself is simple, but it does have some innovative features to represent leadership, staff work, command/control, effects of different weapons, and the ever-shifting sands of morale and politics."
1 turn = 1 week
Other games in the series were Austro-Prussian War (S&T #167); Russo-Turkish War (S&T #154) and Risorgimento (S&T #187).