 During the Middle Ages, the region of Poggio Renatico was fortified by the rulers of Bologna through a discontinuous line of towers and castles that provided exclusive control of fishing and river trade and protection against the expansionist intentions of neighboring Ferrara.About outside Poggio Renatico is one of the Italian Air Force's biggest radar stations, which was formerly used to monitor air traffic over Yugoslavia and southern Warsaw Pact countries.In 2010, NATO controlled its air forces in southern Europe from the Poggio Renatico radar base, and in March 2010 it provided military control over the airspace between the Danube delta and the Atlantic Ocean.