The first point regarding the legitimacy of the raid depends on two claims: first, that the railyards subjected to American precision bombing were an important logistical target, and that the city was also an important industrial centre. Even after the main firebombing, there were two further raids on the Dresden railway yards by the USAAF. The first was on 2 March 1945, by 406 B-17s, which dropped 940 tons of high-explosive bombs and 141 tons of incendiaries. The second was on 17 April, when 580 B-17s dropped 1,554 tons of high-explosive bombs and 165 tons of incendiaries.