Byczyna was fortified at the turn of the 15th and 16th centuries. In the 16th century, work on fortifications was continued, among others, the Sand Tower was built to strengthen the defense. Apparently, under the Polish Gate, archduke Maximilian capitulated after losing the battle of Byczyna in 1588.
The town was surrounded in the Middle Ages with a single ring of the wall and did not have additional fortifications in the form of a moat, only on the northern side of the city were swamps. The length of the walls is currently 912 meters. They run ovally around the city, a line close to the ellipse. The average height of the walls on the outer side of the city is approx. 5,5 – 6 meters, and the thickness 135 – 170 cm.
Two gates led to the town: German from the west and Polish from the east. Both were placed next to high towers, flanking entry roads. The German Tower dates from the fifteenth century, it is made of stone and in higher parts it is made of bricks. Currently, it is topped with a makeshift roof, in the past it had a gable roof. The arched passage was pierced at the end of the 19th century, above it there are narrow arrowslits, and two in each elevation, semicircular closed windows placed in rectangular niches. The Polish Tower was built in the fifteenth century on a square plan on a low stone plinth. It is opped with a ceramic gable roof. The highest part has three arched windows, below arrowslits. An additional reinforcement of the defense of the fortifications was the Sand Tower from the 16th century. It was placed in the southern part of the circuit.
In Byczyna has preserved the original ring of defensive walls from the fourteenth to fifteenth centuries and three towers: Polish from the east, from the German west and Sand Tower from the south. The Polish and German towers flank the entrances to the city on the course of the former trade route. The external environment of the wall circuit is varied. From the north it has the most attractive shape, in the form of a small park with an alley.