A previously unknown fortress has been identified in eastern Poland after researchers used airborne LiDAR scanning to examine subtle terrain features. The discovery reveals the remains of a bastion-style fortification in Chełm County that had gone unrecognized for centuries.
The site lies within the grounds of a historic manor and park complex, where faint earthworks had long been visible but poorly understood. Earlier interpretations suggested the formation might be part of a horseshoe-shaped structure.
According to HeritageDaily, remote sensing analysis has now confirmed that the features belong to a fortified bastion system, sometimes referred to as a fortalicium. The discovery matters because this area saw a lot of military action during the early modern period.
LiDAR Maps The Lost Fortress
Airborne laser scanning, commonly known as LiDAR, allowed researchers to detect subtle variations in the terrain that are difficult to observe from ground level. These patterns revealed the outlines of defensive earthworks that had previously been misinterpreted.
According to archaeologists from th Lublin Voivodeship Conservator of Monuments, the surviving remains represent part of a bastion-style fortification typical of early modern military infrastructure. Only the northwestern section of the fortress survives today, though the traces suggest a layout that was originally rectangular with bastion projections at the four corners.
This configuration reflects common defensive principles used across Europe during that period. The arrangements correspond to systems associated with the French school of fortification engineering. The experts from the Lublin Voivodeship Conservator of Monuments stated that:
“The finding provides a new perspective on the regional defensive actions taken up along the Bug River frontier, at one of the most tumultuous episodes in the Polish-Lithuanian Commonwealth’s history.”
Earthworks Show The Fortress Size
Although much of the fortress has disappeared, the remaining earthworks still rise around two meters above the surrounding ground. In a regional publication, the preserved portion covers approximately 0.4 hectares, offering a glimpse of what once stood there.
Researchers believe the original complex was considerably larger. As explained by the report cited in Earth.com, the fortification may have covered around 1.5 hectares, with an estimated perimeter measuring 120 by 140 meters. These dimensions indicate a permanent or semi-permanent defensive installation, built to protect an important frontier zone near the Bug River.
Historic Maps Confirm The Fortress
Historical documents confirm that this is definitely the site. The fort even appears on an Austrian military map (“West Galizien”) from between 1801 and 1804, and by then, it was already marked as a ruin.
As reported by the archives, it had probably stopped serving as a fortification by the end of the 18th century. And on 19th-century maps, you can see the earthworks gradually fading away, likely due to farming and changes to the landscape.
A few older texts also mention a fort in the area. A 1694 document refers to a “trench” near the Bug River, and an 18th-century note talks about farmland locals called “the shaft.” For the researchers quoted by HeritageDaily, these references might be the last echoes of the time when the fort still guarded the frontier.
