The wartime Scouts evolved into the paramilitary "Szare Szeregi" ("Gray Ranks"), cooperating with the Polish underground state and the Armia Krajowa resistance. Older Scouts carried out sabotage, armed resistance, and assassinations. The Girl Guides formed auxiliary units working as nurses, liaisons and munition carriers. At the same time the youngest Scouts were involved in so-called small sabotage under the auspice of the Wawer organization, which included dropping leaflets or painting the kotwica sign on the walls. During Operation Tempest, and especially during the Warsaw Uprising, the Scouts participated in the fighting, and several "Szare Szeregi" units were some of the most effective in combat.