General Chetwode, with the 5th Cavalry Brigade, encountered the eastern column near Cérizy, moving south. The Brigade attacked and routed the column, the leading German regiment suffering very severe casualties and being almost broken up. The 7th French Army Corps was now in course of being railed up from the south to the east of Amiens. On the 29th it nearly completed its detrainment, and the French 6th Army got into position on my left, its right resting on Roye. The 5th French Army was behind the line of the Oise between La Fère and Guise. The pursuit of the enemy was very vigorous; some five or six German corps were on the Somme, facing the 5th Army on the Oise. At least two corps were advancing towards my front, and were crossing the Somme east and west of Ham. Three or four more German corps were opposing the 6th French Army on my left. This was the situation at one o'clock on the 29th, when I received a visit from General Joffre at my headquarters. I strongly represented my position to the French Commander-in-Chief, who was most kind, cordial, and sympathetic, as he has always been. He told me that he had directed the 5th French Army on the Oise to move forward and attack the Germans on the Somme, with a view to checking pursuit. He also told me of the formation of the 6th French Army on my left flank, composed of the 7th Army Corps, four reserve divisions, and Sordêt's corps of cavalry. I finally arranged with General Joffre to effect a further short retirement towards the line Compiègne-Soissons, promising him, however, to do my utmost to keep always within a day's march of him. In pursuance of this arrangement the British forces retired to a position a few miles north of the line Compiègne-Soissons on the 29th. The right flank of the German army was now reaching a point which appeared seriously to endanger my line of communications with Havre. I had already evacuated Amiens, into which place a German reserve division was reported to have moved. Orders were given to change the base to St. Nazaire, and establish an advance base at Le Mans. This operation was well carried out by the Inspector-General of Communications. In spite of a severe defeat inflicted upon the Guard 10th and Guard Reserve Corps of the German army by the 1st and 3rd French Corps on the right of the 5th Army, it was not part of General Joffre's plan to pursue this advantage, and a general retirement on to the line of the Marne was ordered, to which the French forces in the more eastern theatre were directed to conform. A new army (the 9th) has been formed from three corps in the south by General Joffre, and moved into the space between the right of the 5th and left of the 4th Armies.