In addition to the Iron Cross instituted on 10 March 1813, Kaiser Friedrich Wilhelm III wanted a medal issued to honor all of the combatants who served in the War of Liberation between 1813 and 1815. The Eiserne Kreuz was awarded for bravery (Courage and Commitment) whereas the Kriegsdenkmünze für Kämpfer (War Memorial for Fighters) was issued to all combatants who served the Kaiser during the War of Liberation (Befreiungskriege) against Napoleon. The only prerequisites were service in combat during the period 1813 through 1815 and faithful service with no offenses or excesses during the fighting.
The medal came in seven versions:
1) 1813, 1813/1814, and 1814 with curved cross arms and 1813, 1813/1814, and 1814 with squared cross arms. The curved cross arms are often referred to as "Paris versions" and the squared cross arms are referred to as "Berlin versions". The Berlin type are thought to be replacement medals or late production to be issued to those who didn't initially receive the earlier version. All of these medals were instituted on 24 December 1813.
2) 1815 with squared arms. No record of an 1815 with curved arms exists. Apparently all versions of this medal had squared arms after 1815. This medal was instituted on 30 October 1815.
The 1813/1814 version: OEK# 1913
The 1814 version: OEK# 1916
The 1815 version: OEK# 1914
The reverse of all versions of this medal were identical. Written on the reverse was "Gott war mit uns, Ihm sey die Ehre!" (God was with us, Him be the honor!) and in the center was written "Preußens tapfern Kriegern" (Prussian brave warriors).
On the edge was written "AUS EROBERTEM SCHÜTZ" (FROM CAPTURED CANNON).
I'm still working on completing the set, but I've got a good start.