Of about 4,000 artillery pieces, many were aged and horse-drawn, but about 1,700 were relatively modern, including 812 Czech 37mm and 47mm anti-tank guns.
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The Exhibition at the Zemun Airport included a combined jump of 10 parachutists, including Katarina Matanović, the first and only woman parachutist in Yugoslavia prior to the 1941 war.The Yugoslav Army had realized the significance of parachute units, and a school of parachuting was opened at Pančevo on 1 October 1939.
After the surrender of the Royal Yugoslav Army to the German Army in April 1941, Popović organised the Kosmaj detachment during the rising in Serbia.
Due to his father's (who was now in the Royal Yugoslav Army) job, the family then moved to Čakovec and later to Varaždin, which is where Vladimir graduated high school in 1925.