In 2017, the excavation of the fortifications in Pasym, Szczytno district, was continued. During this time three trenches were excavated (Figure 2). Trench 1/2017 (measuring 15 x 5 m) was laid out in the western part of the fortification, partly on the edge, partly on the slope descending from the west towards the lake. Trench 2/2017 (measuring 15 x 5 m) was located on the eastern slope of the fortification. Trench 3/2017 (measuring 5 x 5 m) was located in a dip situated to the south-east of the fort. The study encompassed an area of 1.75 acres. During the excavations, unusually interesting remains within the courtyard of the stronghold were discovered. Earlier observations concerning the fortification of the site were also confirmed. The powerful defence system has no analogies in contemporary Prussian territories. Particularly valuable were the layers of accumulated deposits dating from the Early Iron Age and the Early Middle Ages.