Mr. Sobieski, it seems as though you are mistaken about a great many things in regards to the setting of the new "All Quiet on the Martian Front" miniature war game.
Fear not, you are not alone, others have made similar gaffes.
If it pleases you I shall attempt to enlighten your understanding.
This is not "War of the Worlds" in its most historical nature in that it does not exclusively represent the initial landings of Martian craft in England somewhere around 1898 or 1899.
The setting is heavily influenced by Wells' book, of that the authors make no claims to the contrary, however the timeline has moved on from Wells' book and the current events and influential people of the times are referenced, such as John Pershing and Teddy Roosevelt, but not HRM Queen Victoria.
This is because the Martian invasion of Surrey and London was in fact a scouting mission. The Martian forces in that action were expendable and were not lost in vain.
The events of AQotMF are set nearly ten years after those events. The scouting mission undoubtedly sent back data, because the Martians aren't dying from a few germs this time.
Military technology has also changed. No longer is horse drawn artillery and naval torpedo boats used in the human struggle, no, for the lowly steam tractor has been given armor and guns and been sent out to do battle with the invaders from another world. Massey-Ferguson never looked so good! Humans have adapted even greater technology in their struggle against the foe.
While the original invasion was in Britain, the secondary invasion happened in the United States and Canada, there were also other cylinders which landed other places as well, but this game is using North America as it's primary setting.
The British are in the game as well, having learned a thing or two about fighting Martians they have assembled an expeditionary force to help combat the alien menace. Undoubtedly they learned a few things the first time around as well and are taking the fight to the interlopers.
So you see, you are correct, "The War of the Worlds" is set in England, but this however is not.
Good day!