A former commander of the 9th Guard Brigade's reconnaissance platoon, Josip Krmpotic, was sentenced to three years in prison by the Zagreb County Court on Thursday for arson and destruction of homes in Serb villages during the 1993 Medak Pocket liberation operation.
Krmpotic can appeal the ruling.
The prosecution also charged Krmpotic with failing to prevent the murder of four prisoners of war, but he was acquitted of those charges.
The defence team announced an appeal.
Krmpotic was arrested and placed in custody in October 2012. Back in 2002 he was interrogated by the U.N. war crimes tribunal (ICTY) investigators over the Medak Pocket war crimes.
Twenty-three Serb civilians and five captured soldiers were killed and 300 houses and other structures were destroyed in the Medak Pocket from September 9 to 17, 1993, when Croatian forces withdrew and handed over the area to UN peacekeepers.