Excerpts from Books and Wikipedia
"The Kosovo War was an armed conflict in Kosovo that started in late February 1998 and lasted until 11 June 1999. It was fought by the forces of the Federal Republic of Yugoslavia (by this time, consisting of the Republics of Montenegro and Serbia), which controlled Kosovo before the war, and the Kosovo Albanian rebel group known as the Kosovo Liberation Army (KLA), with air support from the North Atlantic Treaty Organisation (NATO) from 24 March 1999, and ground support from the Albanian army." [Wikipedia]