Once the retreat from Mons had ended, the next plan was to advance to the River Marne. However, the 2nd Battalion The Royal Irish Rifles was in reserve and morale was high; that was until 11 September. There was a sudden and abominable change in the weather when the temperature dropped drastically and rain fell very heavily. The Riflemen did not have their packs containing extra and change of personal clothing with them and suffered accordingly.