The defensive wall circle adjusted to the shape of the hill, which was a fairly regular oval, forming an angle close to the straight in the south-east corner of the town. The area of the town was over 6 hectares and the length of the fortification lines was over 900 meters. The parish church was located in the north-western part of the town, near the fortifications at the highest point of the hill, and could serve as an observation post. The defensive wall in Tarnów was built of bricks tied in a Polish thread and was placed on a stone foundation. Its thickness was 1.5 meters, height is unknown. The wall had probably battlement, which was in the 15th century or during the general reconstruction in the XVI century converted and covered with roof, probably on the model of Kraków.
The fortifications of Tarnów probably did not originally have towers, because there are no signs and mentions on this subject. It was only during the modernization of the walls in the 16th century that their construction was documented. They reinforced mainly a new external wall, but at least one tower was built, in the inner wall, and from that period came both preserved objects from the north. They differ considerably from one another: the slim tower in the inner wall represents a more traditional form, the tower of outer wall is like a early modern-day object. In the early modern period, the guilds took care of towers.
Tarnów had two main gates, to which the streets from the market converged. From the west it was Cracow gate and from the east Pilsen Gate. Both gates were primar, and Pilsen was built together with a defensive wall. The gates were located in rectangular towers, extended by both sides ahead of the defensive wall. Pilzneńska Gate was put in the direction of the town about 4.6 meters from the inner defensive wall. In the 16th century, during the modernization of fortifications the gates were greatly expanded. They had been given above all a foregates. In addition to the main gates there was a Minor Gate, located in the south side of the town at the exit of Wielkie Schody street. Judging by terrain topography, it was always just a pedestrian crossing. It is not known when it was built. It was probably earlier than some of the other gates mentioned and probably formed in the early modern period.
The outer defense was formed by moats and a shaft, running at the foot of the town hills. It is unknown whether they were primal, but they existed before the sixteenth-century modernization, because Jan Długosz mentioned them. Further regulation and expansion of the system of moats and earth ramparts occurred in the 16th century. The moat was at least partially watered, probably from the Rzędziński stream.
Existing fragments of Tarnów fortifications are almost completely embedded in later developments. Significant parts of the inner wall are preserved under the plaster in the rear walls of the houses in the north-west and north of the town, behind the Cathedral Square. In this area, on the property of Kapitulna 2, there is a tower, quadrangle at the bottom, round at the top, erected from a brick laid in a Polish thread. To the east, on the grounds of Basztowa 4, a fragment of the inner wall was preserved. The only place where you can read the thickness of the wall is a fragment from the east, at Pilsen Gate 4 street. This part is connected by the lateral, northern wall of the Pilzno Gate. Except for the remains of the inner wall, a part of the later outer wall was visible from the north, at the back of Wałowa street. The wall is mostly converted, the only well preserved element is a semi-circular open tower with artillery slits on the property of Basztowa 4.
Widawski J., Miejskie mury obronne w państwie polskim do początku XV wieku, Warszawa 1973.