Yushkevich was born on 28 February 1897 in
Vilna, the son of a postman. After graduating from a six-grade commercial school, he was drafted into the
Imperial Russian Army during
World War I in March 1915 and became a
junker at the
Vilna Military School. At the school, he was promoted to unter-ofitser in July and in September graduated from an accelerated 4-month first level training course with the rank of
praporshchik. Yushkevich was sent to the
Southwestern Front, where he served as a junior officer and then temporary company commander of the 7th
Marching Reserve Battalion of the 3rd Marching Reserve Brigade. In March, 1916 he was placed at the disposal of the chief of staff of the
7th Army Corps of the
11th Army and seconded to the headquarters of the
34th Infantry Division until July, before being appointed a junior officer in a company of the 133rd Simferopol Infantry Regiment, serving as a platoon leader. Between July and August, he fought in battles on the
Seret River and was wounded, but remained at the front. For distinguishing himself, Yushkevich was promoted to
podporuchik in September and in October was awarded the
Order of Saint Stanislaus, 3rd class with swords and knot. He became a company commander of the regiment in August 1917. Yushkevich was drafted into the
Red Army in February 1919 during the
Russian Civil War. He fought against the
Armed Forces of South Russia and the forces of
Nykyfor Hryhoriv. In April 1920, he was appointed commander of the 2nd Separate Guard Battalion in
Katerynoslav, and in June became head of a special purpose detachment. From September 1920, Yushkevich served with the
3rd Rifle Division as acting commander of the 25th Rifle Regiment, commander of the divisional separate reserve battalion, and commander of the 25th Rifle Regiment. He led the regiment in fighting against the
Army of Wrangel on the
Southern Front. From May 1921, he was head of the flying expeditionary detachment of the division, fighting against the remnants of the
Revolutionary Insurgent Army of Ukraine. == Interwar period ==