 During the Polish-Soviet War, Eugeniusz Świerczewski served as an officer and was promoted to the rank of lieutenant.In 1923, he was made an officer of the reserve Infantry Regiment 15 called "Wolves" in Dęblin.He was a second lieutenant with the starszeństwem by July 1921 and continued until 1923. the deposits in the body of the reserve officers of authorizing officers.