In Kiełpiniec, a strong and well-armed Home Army unit was formed under the command of a teacher, Lieutenant Lucjusz Gawryś, pseudonym "Ryś". The activities of the Home Army and life in Kiełpiniec during the war are described in detail by a member of the unit, Juliusz Lemke, in his book "Było, minęła". Landed estates played a significant role in the functioning of military structures. In the Sokołów district, the "Uprawa" organization operated. Within its framework, Władysław and Józef Murawscy from Zagórze provided assistance in providing provisions to the units. The surrounding forests provided shelter to the fighting men and civilians. During the march of the front, Father Marian Podstawka, Sister Sebastian Moskwa, and many residents of Chądzyn and the surrounding areas found shelter in the Smolarnia forester's lodge with Paweł Andrzejewski. During the march of the front, the residents of Kiełpiniec, usually with all their belongings, waited out these difficult days in mounds in the forests near the village. On August 10, 1944, Kiełpiniec was liberated. Unfortunately, the dissolution of the Home Army did not mean the end of the war. Fighting continued. On February 17, 1947, in buildings outside the village belonging to Franciszek Goworek, four partisans of the 6th Wilno Brigade of the Home Army, commanded by Captain Władysław Łukasiuk Młot, were killed.