"Operation Trio (Serbo-Croatian: Operacija Trio) was the first large-scale joint German-Italian counter-insurgency operation of World War II conducted in the Independent State of Croatia (NDH), which included modern-day Bosnia and Herzegovina. It was carried out in two phases within eastern Bosnia from 20 April to 13 May 1942, with Usta\u0161e militia and Croatian Home Guard forces taking part on the Axis side."@en . "*" . . . "* NDH forces" . . . . . "1942-05-13Z"^^ . . . "See theAftermathsection" . "Partisans" . . . "Chetniks (Sand\u017Eak)" . "around 4,000 men" . "NDH" . "* 11 killed" . "* 1 missing" . "* Unknown" . . "Chetniks (East Bosnian)" . "* 149 wounded" . "* 121 missing" . "* Germans" . "* 173 missing" . "* Chetniks" . "* 15 wounded" . "* Italians" . . . "Operation Trio"@en . "* 220 killed" . "* 82 killed" . "* 556 wounded" .