Exactly, initially issued for anti-partisan work in Yugoslavia and some times refered to as the Guerrilla Warfare Badge.
You are correct that it is the bronze one awarded for 20 combat days for ground troops and 30 days for Luftwaffe crews, the one I have is the silver version for 50 and 75 days respectively "liberated" by an uncle in Trieste at the end of the war.
Which means you are up next.
