The New Encyclopedia Britannica, Edition 1986
Reference: EB, Edition 1986, Macropedia, Vol 29, page 1061
Entry: Yugoslavia, Croatia, History
The Vojna Krajina (Militargrenze), a military frontier zone on Croatian territory, was formed in 1578. As THIS ZONE WAS SUBJECT DIRECTLY TO THE EMPEROR IN VIENNA, it meant further loss for the Croats.
Turkish invasion instigated a partial change in the ethnic aspect of Croatian lands. Large numbers of Croats abandoned their homes and moved northward seeking safety, some even going out of Croatia altogether into Austria. In partly depopulated areas the rulers settled......or granted certain privileges to the Serbs who escaped from the Balkans and took refuge in the Vojna Krajina to became defenders of the Habsburg Empire.