 Its most notable operations included the Bloody Wednesday of 15 August 1906; the failed assassination attempt against the Governor-General of Warsaw, Georgi Skalon, 18 August 1906; and Bezdany raid, a major train robbery, 26 September 1908.The first action of the Organizacja Bojowa took place soon after the PPS started to organize an increasing number of demonstrations (mostly in Warsaw).On October 28, 1904, Russian Cossack cavalry trampled the participants in one of the demonstrations; in revenge, on November 13 the 'Bojówki' opened fire on the Russian police and military during a new demonstration.