demolish the fortress completely, as such stories spread among the citizens; he wanted to show to the Austrians that the fortress has its values and importance, and that it can't be destroyed in a day (despite all the shelling, only of rampart was destroyed); or he simply did it to spite the Austrians. The shelling also disturbed the citizens of Zemun, across the Sava, which was part of Austro-Hungary at the time, and some of the grenades which missed the target hit Austro-Hungarian soil, so the imperial government sent an official diplomatic note to Serbia, protesting the shelling and reminding the prince he is only a "caretaker" of the fortress. After the takeover of the fortress, Serbian forces kept finding parts of the gallows, chains, gibbets and impalement stakes in the dungeons, used previously by the Ottomans to torture the prisoners. Official reports by the Serbian army hold claims by the soldiers of the "ghoulish, headless and limbless wraiths" and other abominations roaming the fortress. The army issued an order that, despite there was no enemy anymore, all guards must keep watch "at least in pairs". Mihailo's successor, prince and later king Milan Obrenović, ordered the leveling of the terrain in the eastern sections of the fortress and planting of the greenery and trees, which in time developed into the Kalemegdan Park. Modern While it was inhabited, the fortress formed one of the quarters in the administrative division of Belgrade. It was called Grad ("city") for administrative purposes, and continued to be translated in the foreign languages as "fortress". According to the censuses, it had a population of 2,219 in 1890, 2,281 in 1895, 2,777 in 1900, 2,396 in 1905 and 454 in 1910. Kalemegdan was the location of the second airport in Serbia, after one in the neighborhood of Banjica from 1910. A field in the Donji Grad was adapted for planes in January 1911. It was situated along the bank of the Sava river, from the old Turkish bath (modern Planetarium) to the mouth of the Sava into the Danube. One of the flight pioneers, Edvard Rusjan, died in an airplane crash after taking off from this field and being hit by the gust of košava on 9 January 1911. Remains of Rusjan's plane were originally exhibited in Donji Grad and his funeral was one of the largest recorded in Belgrade. Surviving rib of this airplane became the