I’ve pondered putting together a Patton 3rd Army in Lorraine campaign.  My recent time spent on the Franco-Prussian war and the battles around Metz got me thing about game boards that could be used for both periods.  Not sure there is a perfect fit…the Dornot cross is South of Metz while Rezonville and Gravelotte-St Privat are west and north…but there is some overlap with the operations between Thionville and Metz.