Task: Question Answering
Input (English): Context: Operation Una (Croatian: Operacija Una) was a military offensive conducted by the Croatian Army (Hrvatska vojska -- HV) against the Army of Republika Srpska (Vojska Republike Srpske -- VRS) in western Bosnia and Herzegovina on 18--19 September 1995, during the Bosnian War. 
 Question: On what date did Operation Una end?
Output (English): 19 september 1995