This is a little Euro-style boardgame adaptation that seems to be free to play. I have played a couple of games versus AI and real people, and it does have some interesting twists and turns. The central mechanic is card based - you have a hand of cards that allow you to perform certain actions with certain units, so it's very much more strategic than the old Avalon Hill wargame hell games.

http://www.daysofwonder.com/memoir44-online/en/start/

You may have to create an account to get started - it works for all the Days of Wonder games (Ticket to Ride, Memoir '44, Small World etc.). My account name is 'Dai Caws' if you want to play against another geezer...