In March 1945 he was promoted to the rank of major and became commander of the all supply units of the 15th Waffen Grenadier Division.
At the last days of the war, he led around 4000 Latvian soldiers to the Western Allies thus saving them from Soviet Red army and further repressions.
During Nazi occupation of Latvia, he returned as the head coach of the Rīgas ASK and became Latvian champions for another two times (1942–1943).
In 1939, Baumanis attended summer school for basketball coaches in Long Island, United States.
In 1945, Baumanis left to Germany and an after the Second World War was an active promoter of sports in Latvian exile community.
In the years 1948–1954, he moved to France and served as the head coach of the French basketball team CEP Lorient.
Since 1956, he lived in Chicago where he actively organized sport and basketball events for Latvian community in the US.