'Wolkenbruch' (i) was a German operation against the partisan forces of Josip Broz Tito in the northern part of German-occupied Yugoslavia (21 October/12 November 1943).

Following the armistice which Italy reached with the Allies in September 1943, all of the occupying Italian forces in the Slovene coastal region, Istrian peninsula, Croat coastal region, Gorski Kotar, Notranjsko and Dolenjsko were disarmed even as partisan forces started to arrive with the object of establishing a large new area of liberated Yugoslavia, and also of creating several new brigades as well as the 18^th, 30^th and 31^st 'Slovenia' Divisions of the partisan army. The immediate effect of this change so far as the Germans were concerned was the severance or, at best, severe disruption of their lines of communication between Italy and the valley of the Sava river.

On 19 September German high command ordered Generalfeldmarschall Erwin Rommel, currently heading Heeresgruppe 'B' in northern Italy, to suppress the communist uprising and destroy the partisan forces in Gorski Kotar, eastern Slovenia, the Istrian peninsula, and the Slovenian and Croat littorals, so securing the eastern coast of the Adriatic Sea in that area. Rommel allocated the task to SS-Obergruppenführer und General der Waffen-SS Paul Hausser’s II SS Panzerkorps, and this formation’s operation was the first stage of a series of offensives known to the partisans as the 'Sixth Enemy Offensive'.

The offensive was undertaken, with only limited success, in four phases before the undertaking was terminated to allow the movement of German forces to Italy.

The Axis order of battle for the first and second phases of the operation, which took place on 21/25 October and 26/30 October, totalled 50,000 men as well as more than 150 tanks, 25 assault guns and 90 self-propelled anti-tank guns of the 191^st Grenadierregiment, 194^th Grenadierregiment and 211^th Grenadierregiment and 171^st Artillerieregiment of Generalleutnant Wilhelm Raapke’s 71^st Division reinforced by the 138^th Reserve-Gebirgsjägerregiment and 1^st Panzerregiment of SS-Obergruppenführer und General der Waffen-SS Josef Dietrich’s 1^st SS Panzerdivision 'Leibstandarte SS Adolf Hitler', 901^st Panzergrenadierregiment, two battalions of the 19^th SS Polizeiregiment, SS Bataillon 'Karstjäger', 1/1^st Panzerregiment of Generalmajor Walter Krüger’s 1^st Panzerdivision, 1^st Gebirgsjägerbataillon, 21^st Panzergrenadierregiment of Generalleutnant Maximilian Freiherr von Edelsheim’s 24^th Panzerdivision, and 132^nd Regiment of Generalleutnant Heinrich Deboi’s 44^th Division 'Hoch- und Deutschmeister'.

For the third phase of the operation, starting on 31 October, the German order of battle was based on the 194^th Grenadierregiment of the 71^st Division reinforced by the 901^st Panzergrenadierregiment, the 14^th SS Polizeiregiment, the 44^th Division 'Hoch- und Deutschmeister', the 32^nd Grenadierregiment and the 44^th Aufklärungsabteilung.

For the fourth and last phase of the operation, lasting to 12 November, the German order of battle, comprising 50,000 men, more than 110 tanks, 10 assault guns and more than 140 self-propelled anti-tank guns, was headed by the II SS Panzerkorps and the German-Slovene Domobran garrison in Ljubljana, and included the 1^st SS Panzerregiment of the 1^st SS Panzerdivision, 44^th Division, 132^nd Grenadierregiment, 44^th Aufklärungsabteilung, 303^rd Infanterieregiment (turkestanisches) and 314^th Infanterieregiment (turkestanisches) and 236^th Artillerieregiment (turkestanisches) of Generalleutnant Hermann Franke’s 162^nd Division (turkestanisches), Wehrmannschaftbataillon 'Süd', Gebirgsjägerregiment 'Admont', Gebirgsjägerbataillon 'Heine', 14^th SS Polizeiregiment, reinforced 19^th SS Polizeiregiment, 901^st Panzergrenadierregiment, 112^th Artillerieregiment, small units of SS-Obergruppenführer und General der Waffen-SS Herbert Gille’s 5^th SS Panzerdivision 'Wiking', small units of SS-Obergruppenführer und General der Waffen-SS Fritz Stolz Edler von Barancze’s 11^th SS Panzergrenadierdivision 'Nordland', 194^th Grenadierregiment and other elements of the 71^st Division, and one Slovene home defence battalion.