In the northern part of the village of Borek, there is Fort No. V, built at the end of the 19th century, which is part of the fortifications of the Dęblin fortress
The Dęblin Fortress was erected as a result of the implementation of defensive assumptions developed in Russia in the early 1830s. This was done during the reign of Tsar Nicholas I Romanov after the suppression of the November Uprising and the incorporation of the lands of the Kingdom of Poland into the Russian Empire. The construction of the fortress in Dęblin began in 1838 on the basis of documentation prepared by the outstanding fortifier general engineer Iwan Dehn.
Based on the plans of general engineer Edward Totleben in 1879, further expansion of the fortress was started. In the first stage, six artillery forts were erected around its perimeter until 1882. They were located on both banks of the Vistula and on the left bank of the Wieprz River: Fort I "Młynkowski" (now "Nadwiślanka"), Fort II "Mierzwiączka", Fort III "Dęblin", Fort IV "Borowa", Fort V "Borek", Fort VI "Capercaillie".
In the years 1895-1908, another reconstruction of the fortress was carried out. It covered only the left-bank part of the Vistula, i.e. Fort V Borek, Fort Wannowski and Fort VI Głusiec. As a result of the expansion, a ring fortress was created. A ring of mutually supporting forts formed the main defensive line of the fortress, with the citadel constituting its core of final defence.