Operation Sana (Bosnian: Operacija Sana) was a military offensive undertaken by the Army of the Republic of Bosnia and Herzegovina (Armija Republike Bosne i Hercegovine – ARBiH) in western Bosnia and Herzegovina during the Bosnian War. It was launched from the area of Bihać on 13 September 1995, against the Army of Republika Srpska (Vojska Republike Srpske – VRS), and involved advances towards Bosanski Petrovac, Sanski Most and Bosanska Krupa. At the same time, the Croatian Army (Hrvatska vojska – HV) and the Croatian Defence Council (Hrvatsko vijeće obrane – HVO) were engaging the VRS in Operation Maestral 2 further to the southeast. After an initial 70-kilometre (43 mi) advance, VRS reinforcements managed to stop the ARBiH short of Sanski Most and Novi Grad, and reversed some of the ARBi