I did a quick run of the Battle of Leige in 10mm (Pendrakon) figs aren't painted and I made the forts out of lego so no pics yet. The game ran well - I am using Great War Spearhead so. I had the equivalent of 1 1/2 divisions of Belgians and 2 1/2 Korps of Germans.
Belgians made a bloody mess of the first German assaults. Once the Big Berthas arrived though it was a slow pounding of each fort in succession just like the real thing. The Belgian commander did make one attack with his infantry division to try and disrupt the Germans battle rhythm and while successful for a short period it ended up costing the better part of a full brigade which the Belgians could ill afford to lose.
Overall the game went well and when I get everything painted and the forts all made properly it will look a piece I am sure. I will be taking this to a couple of conventions next year I hope!