Operation Kugelblitz ("ball lightning") was a major anti-Partisan offensive conducted by German forces in December 1943 during World War II in Yugoslavia. The Germans attacked Josip Broz Tito's Partisan forces in the eastern parts of the Independent State of Croatia in an attempt to encircle and destroy them, thereby preventing the Partisans from entering the Territory of the Military Commander in Serbia. Operation Kugelblitz was followed up immediately by Operation Schneesturm (Blizzard) which sought to capitalise on the initial success of Operation Kugelblitz. Both operations are associated with the Sixth Enemy Offensive (Serbo-Croatian: Šesta neprijateljska ofenziva/ofanziva) in Yugoslav Partisan historiography.