The Stratsin–Kumanovo operation (Bulgarian: Страцинско-Кумановска операция) was an offensive operation of the Bulgarian Army in occupied Yugoslavia during the participation of Bulgaria in World War II against the Third Reich, which led to the capture of Skopje in 1944. With the Bulgarian declaration of war on Germany on September 8, followed by Bulgarian withdrawal from the area, the German 1st Mountain Division moved north, occupied Skopje, and secured the strategic Belgrade–Nis–Salonika railroad line. On October 14, the withdrawing from Greece Army Group E faced a lot of Soviet and Bulgarian divisions advancing in Eastern Serbia and North Macedonia, and by November 2 the last German units left Northern Greece.