Q of the Week: Only one period?

[Sandinista]

...if I had to restrict myself to just two armies...

That would be vikings and saxons 10th century

[Shedman]

Bazaine's military career - Algeria, Carlist War, Crimea, Italy 1859, Mexico and finallly the FPW

http://en.wikipedia.org/wiki/Fran%C3%A7ois_Achille_Bazaine

[Paint it Pink]

For me, Science Fiction and the universe background would be Battletech. Why? Because it allows one to play WW1 style games, interwar/civil war style games, and allows one to have tactical developments to simulate WW2, or even Vietnam. Greatest way to disguise scenarios based on real life that I've ever found.