George, I bought the Vignolle book from you years ago, I will review, thanks for the idea.
Your OOB 1813FSXF lists units, including some 1st and 2nd Bns, ordered to Saxony in June of 1813. But some, like the 1,2/40th Line, apparently never left. It would great if such a list existed for the spring of 1813.
One of the regiments I list, thanks to Steven's sources, can be struck from my list. The 6th Line was garrisoning Rome, Corfu, Elba, and other islands, and only the 3, 4, and 7 Bns were sent to Saxony. The 1st and 2nd Bns apparently remained on Corfu.
Two other units I failed to mention were the 2nd Tirailleurs and the 2nd Voltigeurs. They also were apparently serving somewhere other than Spain or Russia in 1812.