Visting this site here:http://armorgames.com/play/2267/warfare-1917
This is sort of an old fashioned side-scroller, but it is very historical in theme, not very easy to beat, and definitely what I would call a wargame. I wasted at least an hour trying to kill some Tommy Adkins in this game. It’s not easy.
Here are some shots of the game where it started to get hard.
I had to give up because it doesn’t save games, sadly.
The side scrolling aspect of it really does a nice job of giving it the War in the Trenches kind of feel.