On the front of the Second Canadian Division the fighting was most severe. The wire in front of the Fresnes-Rouvroy line was found to be almost intact, and although at some points the Fifth Canadian Infantry Brigade (Brigadier General T. L. Tremblay) had succeeded in penetrating the line, the first objective could not be secured, except one short length on the extreme right. Subjected to heavy machine-gun fire from both flanks as well as frontally, the attacking troops had suffered heavy casualties, which they had borne with the utmost fortitude. At nightfall the general line of the Second Canadian Division was little in advance of the line held the night before, although a few small parties of stubborn men were still as far forward as the wire of the Fresnes-Rouvroy line. Enemy reenforcements were seen dribbling forward all day long. The Second and Third Canadian Divisions were now exhausted, and during the night of August 28-29, 1918, they were relieved by the First Canadian Division on the right, the Fourth (British) Division on the left, and Brutinel's Brigade (formerly the Canadian Independent Force) on the extreme left flank. The heavy artillery from now on concentrated on the cutting of the broad belts of wire in front of the Drocourt-Queant line, and the engineers prepared the bridging material required for the crossings of the Sensee River and the Canal du Nord. During the day (August 29, 1918) the Canadian line had been considerably improved by minor operations. On August 30, 1918, the First Canadian Division attacked the Vis-en-Artois Switch, Upton Wood, and the Fresnes-Rouvroy line south of the Vis-en-Artois Switch. The attack, a daring maneuver, organized and carried out by the First Canadian Infantry Brigade (Brigadier General W. A. Griesbach), under cover of very ingenious barrages arranged by the C. R. A., First Canadian Division (Brigadier General H. C. Thacker), was eminently successful, all objectives being captured and the entire garrison either killed or taken prisoner. Heavy counterattacks by fresh troops were repulsed during the afternoon and following night. On August 31, 1918, the remainder of the Fresnes-Rouvroy line south of the Arras-Cambrai road, including Ocean Work, was captured by the Second Canadian Infantry Brigade (Brigadier General F. O. W. Loomis). In the meantime, the Fourth (British) Division had doggedly pushed ahead, crossing the valley of the Sensee River and capturing the villages of Haucourt, Remy, and Eterpigny. This advance was over very difficult, thickly wooded country, and the fighting was very heavy, particularly in the vicinity of St.-Servin's Farm, which, after changing hands several times, remained in possession of the enemy until September 2, 1918. On the night of August 31-September 1 the Fourth Canadian Division came into the line on a one-brigade front between the First Canadian Division and Fourth (British) Division.