"No detailed information or remnants of RDL [Russisch-Deutsche Legion] regimental Colours are available. The only information I found was a letter from Ernst Friedrich Graf von Münster, a passionate enemy of Napoleon and influential Hanoverian member of the British cabinet, who played the role of an intermediary between England and the Continent, to Stein [Carl Freiherr vom und zum Stein]. Münster here mentions his proposal for a RDL Regimental flag: St George killing the dragon with the inscription "Heran! Gekommen ist die Zeit, es fällt der bunte Drache, aus allen Landen weit und breit erschallt der Ruf der Rache. (Trans: Come on! The time has come, the motley dragon falls, out of all countries far and wide the call of revenge resounds). The most popular patriotic writer of his time, Ernst Moritz Arndt, mentions the "sign" in a leaflet he wrote. He adds that St George was encircled by oak leaves. He gives the beginning words of the text a little different: "Auf! Auf! gekommen ist die Zeit, (sic!)..." (English: Up! Up! the time has come..." but also "Come on"..." Arndt's version is probably the more accurate one, since he was at Königsberg and in contact with the committee when he wrote his leaflet."
James gives a reference for Arndt as "Zwei Worte über die Enstehhung und Bestimmeung der teutschen (sic) Legion, Berlin 1813. He has 9 other sources for his article, all German books, but it is not clear which one the Münster quote comes from.
Of course this was only a proposal, and does not prove that such a flag was actually adopted but it is interesting nevertheless.
Rod