Jędrusie (literally Little Andrews) was a Polish underground guerrilla group during World War II, created in 1941.The Jędrusie were active in Kraków, Sandomierz, Tarnobrzeg, Opatów, Rzeszów, Mielec and other areas of Central Poland and carried over a variety of tasks related to sabotage and diversion.Initially engaged mostly in training, reconnaissance, intelligence and distribution of underground press, since 1941 the group also started to organize armed resistance.Jędrusie also organized material help for the families of resistance fighters, prisoners of war and concentration camp inmates, collected food for the prisoners held in POW camps, served as a criminal police in the areas of its operation and organized underground education, with secret schools preparing for a secret matura and underground NCO schools for military training.After the start of the Operation Tempest in 1944, the unit fought together with the rest of the regiment against the German forces defending the bridgehead near Baranów and Sandomierz against the Red Army.