 Among encountered difficulties were cloudy weather and problems with fuel supply (especially with the B-70 gasoline used by the Po-2).Due to such circumstances units of the 4th Division were flying only between March 9 – March 11 and March 13 – March 15, (the 2nd Reg.equipped with Po-2 flew only on the night of March 11 – March 12) while battle continued from March 5 to March 17.