The town walls of the Nowe Miasto Lubawskie were erected in the first half of the 14th century on the site of older, makeshift wooden and earth fortifications. In the first stage, entrances to the town were strengthened by building brick gatehouses. In the second half of the 14th century, further fortifications were extended. In the second half of the fourteenth century, their expansion took place. In the 17th century, the fortifications were partially destroyed, although during the Swedish wars they successfully stopped the attacks of the enemies. The total decline of the significance of the town walls of Nowe Miasto Lubawskie occurred in the 19th century, and the brick and stone obtained from them, constituted a source of building material for erecting houses. In the 30s of the 20th century, pedestrian crossings were pierced in both of the preserved gatehouses, and in the 1950s Brodnica Gate was adapted to the seat of the Museum of the Lubawa Region.
The line of defensive walls was marked out around the perimeter of a trapezoidal shape. The upper parts of the walls were built of brick, whereas the foundation parts were made of granite, field stones. In order to strengthen the defense of the wall, 21 open from the town side, rectangular half towers, were built into the main sequence of the fortifications. In three corners of the walls, closed, cylindrical towers were built, and in the fourth corner a square one. Three gates led to the town: Bratian Gate from the north side, from north-west Lubawa Gate, also known as Łąkowska, which was equipped with the foregate and from the southwestern side Brodnica Gate, also known as Kurzętnik Gate. The external replenishment of the fortifications was a double moat, fed with water from the Drwęca river and a earth ramparts.
The most valuable, preserved element of the Nowe Miasto Lubawskie fortifications are two gothic gate towers: Lubawa and Brodnica Gates. The most readable fragments of urban fortifications are located in the southern part of the town, west of Brodnica Tower; along Okólna street and in the north-east part, near the parish church of St. Thomas, where relics of the corner round tower have also been preserved.
Website zabytek.pl, Miejskie mury obronne Nowe Miasto Lubawskie.