Kaczorowski was active in Polish scouting movement, organized anti-Soviet resistance in 1939-1940. He was arrested, sentenced to death, which was commuted to 10 years of hard labour. He was then released in 1941. He joined Anders Army and fought in a battle of Monte Cassino. Kaczorowski decided to remain in exile in the United Kingdom after the establishment of the communist government. He worked for many years as economist, but never became a British citizen. He was active in emigree circles. He was the head of exiled Polish scouting for example.