Extended almost to the breaking point, in danger of being annihilated by overwhelming attacks, the corps confidently awaited the assault. All ranks of the corps were unanimous in their ardent resolve to hold to the last every inch of the ground intrusted to their keeping. It was for them a matter of great pride that their front was substantially the only part of the British line which had not budged, and one and all felt that it could not budge so long as they were alive. Eventually, the First, Third, and Fourth Canadian Divisions were relieved in their sectors by the Fifteenth, Fifty-first, Fifty-second, Twentieth, and Twenty-fourth British Divisions. The relief started on May 1 and was completed on May 7, 1918. As the relief progressed, the Canadian Corps handed over command of the Avion-Lens-St.-Emile-Hill 70 sectors to the Eighteenth Corps and the balance of the front to the Seventeenth Corps. The length of front held by the Canadian Corps at the various stages of the German offensive has been given previously, but it is here recalled that from April 10, 1918, until relieved the corps held a line exceeding 29,000 yards in length; the Second Canadian Division, then with the Sixth Corps, was holding 6,000 yards of front, making a total length of 35,000 yards of front held by the four Canadian divisions. The total length of the line held by the British army between the Oise and the sea was approximately 100 miles, therefore the Canadian troops were holding approximately one-fifth of the total front. Thus, although the Canadian Corps did not, during this period, have to repulse any German attacks on its front, it nevertheless played a part worthy of its strength during that period. On completion of the relief on May 7, 1918, with the exception of the Second Canadian Division, which was still in the line in the Third Army area, the Canadian Corps was placed in the General Headquarters reserve in the First Army area (Arras sector), and disposed as follows: Headquarters--Pernes, and later Bryas. First Canadian Division--Le Cauroy area. Third Canadian Division--St. Hilaire area. Fourth Canadian Division--Monchy-Bréton area. One infantry brigade and one machine-gun company from each Canadian division were billeted well forward in support of the corps in the line as follows: (a) One infantry brigade, one machine-gun company--Anzin area. Support, Seventeenth Corps. (b) One infantry brigade, one machine-gun company--Château de la Haie area. Support, Eighteenth Corps. (c) One infantry brigade, one machine-gun company--Ham en Artois area. Support, Eleventh Corps. These brigades were kept under one hour's notice from 5.00 a. m. to 7.00 a. m. daily and under four hours' notice during the remainder of the day. The remainder of the Canadian Corps was under four hours' notice.