 Complete the following phrase:  On October 31, 1918, Lieutet Colonel Bortnowski joined the Polish Army which was reborn after Poland had regained her independence at the conclusion of World War I. Initially, he led a company in the 5th Infantry Regiment, and was later promoted to lead a battalion of the 5th Infantry Regiment. In November 1918, he participated in both the Sieges of Przemyśl and 