XV Mountain Corps failed to recognise and exploit these flaws in Partisan deployments. After the 500th Parachute Battalion had been relieved, the XV Mountain Corps ordered the units in the Drvar area to disperse. The 92nd Motorised Regiment with all subordinated units was ordered to return north and attack the brigades of the 4th Krajina Division on Mount Grmeč, to secure the main supply road from Bihać to Bosanski Petrovac; this action, codenamed Grmeč, was scheduled to start on the morning of 27 May. The 373rd Division with the newly subordinated 1st Regiment of the Brandenburg Division was ordered to conduct a sweep-and-destroy operation in the area south and southeast of Drvar; this operation was codenamed Vijenac, and was to take place concurrently with Operation Grmeč. The 9th Dalmatian Division managed to repulse all attacks on 27 May, pushing the Brandenburgers and Chetniks back to Bosansko Grahovo. On 27 May, the 369th Reconnaissance Battalion column again tried to advance on Glamoč, but with no success.