For a better map look at Bogdanowitsch book on the campaign in the Russian State Library. I think this was commented before, more maps from 1814 campaign are available in russian

http://dlib.rsl.ru/view.php?path=/rsl01003000000/rsl01003862000/rsl01003862085/rsl01003862085.pdf#?page=248

The legend is on p.247 and Pskov cuirassiers (from Kretov division) are G