Re: 13e régiments de cuirassiers:

16.x.1807 formation of 1er régiment provisoire:

http://books.google.com/books?id=NbjSAAAAMAAJ&pg=PA492

2.x.1808 date of 13e regiment de cuirassiers formation given in Quintin p 906.

13.ii.1809 date colonel d'Aigremont appointed col of 13th cuirassiers (Note: he was already col of 1st provisinal from 6.xii.1807). See Six, Vol 1, p 6.

29.xii.1809 date of 13e regiment de cuirassiers formation given by Pascal.

Go figure.