German anti-Nazi resistance groups in Düsseldorf attempted to surrender the city to the Allied armies in the so-called "Aktion Rheinland" in order to spare Düsseldorf from further destruction. However, SS units were able to crush the resistance, and executed a number of those involved. Executions of foreign labourers and political prisoners by the Gestapo had already been occurring since February. The act of resistance did accomplish a cancellation of further bombings on the city by another 800 bombers, through contact with the Americans. Düsseldorf was captured by Americans on 17 April without any notable fighting.