'Wildsau' (iii) was a German and Croat operation against the partisan forces of Marshal Josip Broz Tito in the area to the west of the railway linking Ðurmanec and Krapinske Toplice in the puppet state of Croatia in German-occupied Yugoslavia (6/7 June 1944).

The undertaking’s objective was to surround and destroy undetermined partisan groups along the western side of the main railway some 15.5 to 28 miles (25 to 45 km) to the north of Zagreb, where the partisans had been responsible for numerous train derailments and sabotage of the line. The German contribution to the operation was the 15^th Polizei-Freiwilligen-Bataillon (kroatisch), and the Croat contribution the Mobile Group of Ustase Pukovnik Ante Moskov’s Poglavnik Bodyguard Division, one infantry battalion of the PRD, and one battalion of the 1^st Traffic Control Brigade of the Ustase militia.

The operation was completed according to plan, but there are no firm details other than German claims for 48 partisans killed and seven captured.