just in case you did now know or get them before. There are two unique medals in Historical Battles – one you get for winning one battle for both sides in Kursk (eg. one win for the Germans, the other for Russians), the other you get for winning on both sides in Ardennes.
On Wednesday, we are getting new patch 9.1, which will remove these two historical battles and with them the possibility to get these medals, until they return (if they ever do). So, if you want them, go play these two HB’s :) There is one such medal for Balaton as well, but that one stays in 9.1, so you can get it later.