The JNA attacks on Dubrovnik and Zadar were supported by the Yugoslav Navy, which blockaded the coast on two more occasions. On 3 October, all shipping off Croatia, except for ferry lines to Pag and islands in the Kvarner Gulf, was halted. The blockade, except for that of Dubrovnik, was lifted on 11 October. The final blockade, restricting access to Rijeka, Zadar, Šibenik and Split in addition to Dubrovnik, started on 8 November. On 15 November, the Yugoslav Navy sustained losses when it unsuccessfully attacked Split and the island of Brač. The Yugoslav blockade in the northern Adriatic ended on 22 November, but in the southern Adriaticexcept off Dubrovnikit was lifted on 3 December. On 8 October, Croatia declared independence from Yugoslavia. Even though the declaration had been preceded the day before by a Yugoslav Air Force attack on the presidential office in Zagreb, the Croatian authorities considered that the war situation was no longer critical. This assessment was followed by an order to prepare plans for a counter-offensive on 12 October, and three more orders to commence offensive operations, which were issued by 20 November. The plans involved containing the JNA south of Osijek, advancing to the Bosut River south of Vinkovci, recapturing Jasenovac and the Okučani–Lipik road to secure the Papuk and Psunj mountains, advancing towards Petrinja, Glina, Slunj, Korenica and Gračac, recapturing the Maslenica Bridge and the Obrovac–Gračac road, and stopping the JNA advance north-west of Dubrovnik. The most significant results were produced in western Slavonia, where Croatian forces began pushing the JNA away from Grubišno Polje towards Lipik on 31 October, and away from Nova Gradiška towards Okučani on 12 November. In mid-November, another push along the Novska–Okučani axis recaptured several villages by 9 December, while Lipik was recaptured by the Croatian forcesnow renamed the HVon 7 December. The mountains of Papuk and Bilogora, north of Pakrac where the Croatian Serb militia was not supported by the JNA, were brought under Croatian control in the same period. A HV offensive to recapture the Okučani area, codenamed Operation Orkan 91, commenced in the final days of December.