Until the major rising in 1944, the Home Army concentrated on self-defense (the freeing of prisoners and hostages, defense against German pacification operations) and on attacks against German forces. Home Army units carried out thousands of armed raids and intelligence operations, sabotaged hundreds of railway shipments, and participated in many partisan clashes and battles with German police and Wehrmacht units. The Home Army also assassinated prominent Nazi collaborators and Gestapo officials in retaliation against Nazi terror inflicted on Poland's civilian population; prominent individuals assassinated by the Home Army included Igo Sym (1941) and Franz Kutschera (1944).