The divisions of the 15th "Aufstellungswelle" began to be assembled in April 1941 as occupation forces in the Balkans, where the Germans had recently invaded Yugoslavia and assisted Italy in the Battle of Greece The divisions, two infantry regiments, were weaker than the previous waves. Their regiments lacked infantry-gun and anti-tank artillery companies, and their battalions lacked heavy machine-gun companies. The divisions saw significant combat with the Yugoslav Partisans. The thirty regiments needed for the fifteen divisions were raised in accordance with a 13 April 1941 order, with two regiments assembled from each military district ("Wehrkreis"). The 702nd and 704th Divisions were ready by 1 May 1941, and the remaining divisions were ready two weeks later. The wave consisted of 15 infantry divisions: the 702nd, the 704th and the 707th through 719th.