Józef Dowbor-Muśnicki remained the commander of the so-called Greater Poland Front until the outbreak of the Polish-Bolshevik War, after which he resigned his post and applied to Józef Piłsudski for a new assignment. After General Stanisław Szeptycki declined to take the post of the commanding officer of the Ukrainian Front from General Wacław Iwaszkiewicz, the post was offered to Dowbor-Muśnicki, who refused. Having no further assignments, in March 1920 he resigned all his posts in the army and settled in Lusowo and then in Batorowo near Poznań. Opposing Piłsudski's Coup d'État of 1926, he did not rejoin the army during the internal struggle. Instead, he focused on writing his memoirs, "Moje wspomnienia" ("My Memoirs"). He suffered a heart attack on October 26, 1937 and was buried at the family tomb at the local cemetery.