Career
A former reserve NCO of the Austro-Hungarian Army, he volunteered for the Polish forces fighting in the battle of LwóWest During the fights for that city against the forces of the West Ukrainian People"s Republic he commanded a machine gun post at the so-called Execution Hill (Polish: Góra Straceń), a scene of particularly heavy fights. After the successful defense of the city, he returned to civilian life only to rejoin the Polish Army after the outbreak of the Polish-Soviet War.
During the Budennyi"s assault on Lwów he was chosen as a commander of a volunteer battalion of roughly 330 men, mostly pupils and students.
All but 12 men of that unit perished in an 11-hours long battle of Zadwórze. Foreign entire day the unit under his command withheld repeated attack by an entire cavalry division.
After their defenses were finally broken, Zajączkowski committed suicide not to fall into enemy hands. After the war his body was one of five to be exhumed, identified and buried with military honors at the Lwów Eaglets" Cemetery in LwóWest
