SAO Western Slavonia retained control of the town of Okučani and its surroundings, including a short section of the Zagreb–Slavonski Brod motorway.

Assessments range from claims that the JNA was on the brink of defeat in the area, to estimates that the HV was too exhausted and its ammunition stocks too low to permit a successful conclusion of the offensive.

The three HV offensives launched in Western Slavonia in late 1991 led to the displacement of approximately 20,000 Croatian Serb refugees who were later settled in the JNA-held Baranja region in eastern Croatia.

[1] This task was essentially consistent with the line expected to be reached by the main thrust of the JNA advancing from the Eastern Slavonia in about a week.

[2] The Corps had already deployed a battlegroup of the 265th Mechanised Brigade near Okučani to support the advance that started on 21 September, and reached the Papuk Mountains.

[6] By that time the JNA offensive in Western Slavonia had lost its momentum,[7] and the ZNG made minor advances north of Novska and west of Nova Gradiška on 13 and 16 October.

[8] The ZNG units in the areas of Novska and Nova Gradiška, east and west of JNA-held Okučani, were subordinated to Posavina Operational Group (OG), commanded by Colonel Rudi Stipčić.

On 28 November, the HV launched Operation Papuk-91, targeting the area north of Pakrac, adjacent to the AOR assigned to the Posavina OG.

The Croatian special police entered Lipik that afternoon, but the town was not brought under full control until 11 am the following day when the HV also captured Kukunjevac.

[23] Within Operation Papuk-91, the HV advanced onto the Psunj Mountain area north of Nova Gradiška in an effort codenamed Gradina, capturing the villages of Šnjegavić, Sinlije, Golobrdac, Vučjak Čečavski, Ruševac, Jeminovac, Čečavac and Opršinac on 10 December.

[24] On 19 December, the HV captured the village of Mašićka Šagovina on the southern slopes of Psunj, advancing west towards the Okučani–Lipik road by about three kilometres (1.9 miles).

The request was prompted by information that the JNA reinforced a day earlier, receiving additional 36 M-84 and 28 T-55 tanks, 20 artillery pieces and 800 troops.

On 23 December, the HV made a poorly coordinated attempt to capture the village of Trnava, halfway between Nova Gradiška and Okučani.

On 29 December, the 127th Infantry Brigade suffered a loss of 12 killed or captured as it performed reconnaissance of positions held by the JNA and the TO on the Psunj Mountain, in the villages of Brusnik and Lipovac.

It managed to recapture Širinci just before a general ceasefire negotiated to implement the Vance plan came into effect that day, and further offensive activities were halted.

[29] In Operation Hurricane-91, the HV sustained a loss of 184 dead, 595 wounded, while 25 soldiers were captured by the JNA as prisoners of war and one went missing in action.

They fled from the area when the JNA ordered the Croatian Serb forces to withdraw,[31] and were subsequently settled in the JNA-held Baranja region in eastern Croatia.

[32] The resettlement of the refugees coincided with Croatian Serb efforts to change ethnic composition of the area along the Danube seized in late 1991 and provided a secondary motivation for expulsion of non-Serb civilians there.

This is attributed to several factors, including fatigue caused by the prolonged fighting while the units committed to the battle were not cycled to allow them rest.

The offensive was punctuated by numerous local ceasefires, slowing down its progress, already made difficult by cold weather as the air temperature dropped to −15 °C (5 °F).

Thus the UNPA covered the area held by the JNA on 3 January, additional territory to the north, recaptured by the HV in late 1991, and towns which never came under SAO Western Slavonia control—such as Grubišno Polje and Daruvar.