By 11 September, the fuel situation was acute, and logistics failed. On the first day his units were flying three missions every day, now it was reduced to one per day. Despite the problems, by 8 September Richthofen was preparing an assault on Warsaw. The raids had barely begun when a major threat developed behind him. A Polish counter offensive engaged the German Eighth Army, in an attempt to reach the Vistula river. Richthofen joined the assault and counterattack from the air. For three days the Germans bombed Polish forces contributing to the success in the Battle of Radom and Battle of the Bzura. Richthofen sent his air units up under orders to spend only ten minutes over the battlefield, and to expend all ammunition. Polish forces sought refuge in the forests nearby but were smoked out by incendiaries. Richthofen's men flew 750 sorties and dropped 388 tons of bombs. The air action destroyed remaining resistance, allowing the army to defeat the remaining Polish forces.