In the museum, among others, there is a large collection of militaria from the period 1865-1965. Most impressive is the T-34 tank standing in front of the house and a German Tiger tank. The museum building include: heavy machine guns, Soviet rifles of the 50's, collection of pistols and revolvers from the times of both wars used in various armies, a collection of 84 rifles (the oldest dates from the eighteenth century), bladed weapons (eg sword from the twelfth century found around Wiśniewo and Lithuanian sword of the fifteenth century dug out in Grunwald, sabers belonging to the Lancers from the DP 20th divisional cavalry).
The library is the largest museum department, as it contains about 6,000 volumes, including about a thousand published abroad. The collections are mainly military-historical books. Noteworthy is the collection of portraits of the presidents of Independent Poland. Also interesting is the collection of commemorative cards and stamps, which were issued in Exile by museums and veterans associations to commemorate such anniversaries of important events, circumstances, etc.