An attack by I Corps failed on 6 September and attacks were delayed for six days, as the difficulty in supplying such a large force on the north bank was made worse by rain. The Sixth Army front had increased in length, diverged from the line of the Fourth Army advance and a defensive flank being made along Combles ravine by I Corps. V Corps in army reserve was moved forward and Foch issued warning orders for the Cavalry Corps to prepare to exploit a German collapse. Transport difficulties became so bad that Guillaumat ordered all stranded vehicles to be thrown off the roads and to move in daylight, despite German artillery-fire, ready for the resumption of attacks on 12 September.