Here’s a website with lots of information on smuggling in Britain in the 18th Century. I think there’s lots of gaming potential here.
Outlaws and Highwaymen is a terrific site loaded with information about English criminal history.a
For many years, George’s Nafziger’s collection of orders of battle for conflicts dating from the 1600s to the 1900s have been a mainstay of the historical wargaming community.
Once available only commercially, Nafziger recently donated his collection to the Army’s Combined Arms Research Library.
Gross Jagersdorf is a free board game of the August 30, 1757 battle between the Russians and Prussians in the Seven Years War.
The New York Public Library has a large collection of color plates of the armies of Finland in the 18th and early 19th centuries.