The battle of Cambrai.
Under cover of the darkness the British withdrew from the salient about Bourlon Wood during the night of December 4-5, 1917, to a prepared line which would be stronger and easier to hold. Not until some hours had passed did the Germans discover the retirement, when they swarmed into the vacant territory and dug themselves in. Bourlon Wood had been generally stripped of troops; only a rear guard being left when the British retired, and they were later withdrawn. The Germans continued, however, to bombard the wood, showing that they were all in the dark concerning British movements.
The devastated area which the British had abandoned, and which included the mined towns of Graincourt, Anneux, Cantaing, Noyelles, Marcoing, and Masnières, was gradually occupied by the Germans. They had no easy task before them, for the British guns dominated this desert with tons of explosives, and hundreds of shells were hurled into their advanced ranks as they went forward to prospect for desirable positions for defense. Meanwhile the British army had found exceptional quarters in the captured Hindenburg trenches with their wonderful dugouts and network of front-line and communication trenches, all ready for occupancy.
There was continued fighting during the 6th between advanced patrols of British and Germans. North of La Vacquerie Ulster troops won some important defenses that strengthened the British line.
Artillery duels and sporadic raids were the only military events in this fighting area during the several succeeding days. The British anticipated that this lull would be followed by renewed fighting, for it was known that the Germans had been bringing forward strong reenforcements, probably from the Russian front.
The German offensive began on December 12, 1917, but was far from being as formidable as the British feared. The first attack was made at dawn against an elbow in the bend of the British line between Bullecourt and Queant, about ten miles west of Cambrai. The Germans were in strong force, the troops, principally from Bavaria, advancing in waves and close formation, and by sheer weight of numbers won about 500 yards of front-line trenches before they could be checked. Other attacks were made from the east, and the third south of Riencourt, both of which were shattered by British rifle and machine-gun fire.
The Germans were evidently trying to discover weak spots in the British lines by a process of testing, for on December 14, 1917, they made an assault on the Ypres front in Flanders. The stroke was delivered on a front of about 300 yards southeast of Polygon Wood, against British positions near Polderhoek Château. They won a section of front-line trench, but were repulsed at all other points of attack.
East of Bullecourt, in the Cambrai area, German gunfire had increased in violence. During the night the British engaged in bomb fighting that was highly successful, and enabled them to improve their lines. North of Bullecourt in the afternoon of December 15, 1917, the British carried out a successful raid in which a number of prisoners were captured and enemy dugouts and defenses were destroyed.
Snow began to fall during the night on this date, and by morning the countryside was deeply covered, and the ugly scars of battle hidden from sight. The snow lay in heavy drifts on the roads and fields. No military operation was possible, and even the sinister-looking guns were silent.
This white truce was appreciated by the British as it must have been by the soldiers of the kaiser, for both armies had been under a severe strain since General Byng's advance on Cambrai, November 20, 1917.