On March 28, 1918, the Germans launched a very heavy attack in the Arras sector from Gavrelle to Puisieux. The Third, Fifteenth, Fourth, and Fifty-sixth British Divisions successfully repulsed this offensive. The attack was renewed in the afternoon, north of the Scarpe, on the front of the Fifty-sixth Division, but did not there meet with greater success. A certain amount of ground had, however, been captured by the enemy. The renewed attack on the Fifty-sixth Division had considerably lowered its power of resistance. German prisoners captured in the morning were insistent that the attack would be renewed again on the 29th, by storm troops which had been held in reserve for the purpose of capturing the Vimy Ridge by attacking it from the south. It was most urgent that the Fifty-sixth Division should be supported without delay. On March 28, 1918, the Fourth Canadian Division, then holding the Lens-St.-Emile-Hill 70 sector, was relieved by the Forty-sixth British Division, First Corps, and in turn relieved the Fifty-sixth British Division in the Oppy-Gavrelle sector. On the completion of this relief the Canadian Corps was to relieve the Thirteenth Corps, and General Sir Currie again assumed command of the Third and Fourth Canadian Divisions. In the meantime all the battalions which the Fourth Canadian Divisions could spare were to be sent at once by the quickest way to the support of the Fifty-sixth Division. The Fourth Canadian Division, therefore, immediately organized a Composite Brigade, under Brigadier General V. W. Odlum, consisting of the three reserve battalions of the Tenth, Eleventh, and Twelfth Brigades, and the support battalions of the Eleventh and Twelfth Brigades. This Composite Brigade was moved in haste by light railway and lorry to the vicinity of Mont St.-Eloi, from whence it marched into reserve positions during daylight on the 28th. On the night of the 28th-29th the units of the Fifty-sixth Division which had been most heavily engaged were relieved by these five Canadian battalions, which came under orders of the Third Canadian Division. It was not until about 10.00 p. m., on the night of the 28th-29th, that the leading troops of the Forty-sixth Division arrived and began to relieve the Fourth Canadian Division. In view of the seriousness of the situation, units of the Fourth Canadian Division were moved, as the relief progressed, by lorry and light railway to Neuville St.-Vaast, and marched quickly into the line to relieve the elements of the Fifty-sixth Division. The situation of the Canadian divisions at noon, March 30, 1918, after some other readjustments had been carried into effect, was as follows: Third Army. Under Sixth Corps--Second Canadian Division: Neuville-Vitasse sector. Under Seventeenth Corps--First Canadian Division: Telegraph Hill sector.