Following the Battle of France, Meyer's company was reorganized into the LSSAH's reconnaissance battalion and he was promoted. Benito Mussolini's unsuccessful invasion of Greece prompted Germany to invade Yugoslavia and Greece in April 1941. During the invasion, the battalion came under fire from the Greek Army defending the Klisura Pass. After heavy fighting, Meyer's troops broke through the defensive lines; with the road now open, the German forces drove through to the Kastoria area to cut off retreating Greek and British Commonwealth forces. After the campaign, Meyer was awarded the Knight's Cross of the Iron Cross.