and German military units. The best-known operations were: Operation Wawer-Palmiry – a major propaganda campaign which included painting patriotic and anti-German slogans on walls (see also kotwica); distribution of leaflets, posters stickers, and fake issues of supposed German newspapers; intercepting German propaganda megaphones and using them to spread Polish propaganda; destroying German flags and other symbols; disrupting German events by setting off fire alarms; and, last but not least, stink-bombing German-operated movie theaters. Probably the best-known action was the removal of a German-language plaque that had been attached by the Germans to the Nicolaus Copernicus Monument in Warsaw, claiming the astronomer for the German nation. Operation N – the distribution of propaganda newspapers and leaflets among German soldiers stationed in Poland. Operation WISS (Wywiad – Informacja Szarych Szeregów, Grey Ranks Intelligence)—an operation on behalf of Home Army intelligence, in which Combat Schools groups carried out surveillance of German military units and their movements. The information that was gathered was passed on to the Allies. The operation provided the Allies with complete lists of German units, their insignia and approximate complements, including units down to battalion size. Other famous operations included marking street lamps as "Nur für Deutsche" ("Only for Germans"), implying that those who hanged people would themselves be hanged (from street lamps). Other operations occurred after the Germans began destroying monuments to Polish national heroes and historical personalities. These included a monument to Jan Kiliński, leader of an 18th-century Warsaw uprising against the Russians during the Kościuszko Uprising. The Germans dismantled the monument and placed it in the cellars of the former National Museum, for delivery to a German steel mill. The scouts were notified of where the monument was hidden and overnight marked the walls of the former museum, "People of Warsaw! I am here. Kiliński". As part of their secret training, the Combat Schools boys and girls prepared for service with the Home Army as members of commanders' troops, communication units, and reconnaissance units. During the Warsaw Uprising, Combat Schools units in Warsaw's Downtown District formed a company; in other districts, they formed platoons. Assault groups The Assault Groups (Grupy Szturmowe), comprising youngsters aged 17 and up, were directly subordinate to the Home Army's KeDyw (Directorate of Diversion). The groups trained at secret NCO schools and officer schools for commanders of motorised and engineering units. Most members also studied at underground universities, to gain the knowledge necessary