The Champagne front between Rheims and Verdun offered the most favorable field for the Germans to deliver a hard blow. By a strong offensive the French positions to the east, in the Argonne Forest, might be turned, compelling the French to draw their lines back; converting into a narrow-necked wedge the Verdun lines, which would be hemmed in on nearly every side. On the Alsace and Lorraine fronts there was little to fear of any strong action on the part of the Germans, as every movement must be made through narrow passes, conditions that rendered large operations impossible. Meanwhile the Germans were evidently testing the French fronts for a weak spot where they might strike a shrewd blow. Around Verdun and farther east the German guns thundered unceasingly, and German trench raids were of daily and nightly occurrence throughout the month of December. For "a worn-out army," as the French troops had been called by their enemies, they fought with astonishing spirit. The Germans made slight gains from time to time, but they were unable to retain them. On the Cambrai front the fighting was confined to raids and minor actions of slight importance. On December 30, 1917, the Germans made strong local attacks on a front of over two miles against the British position on the spur known as Welsh Ridge south of Cambrai. The attackers were forced back in the center, but on the right, toward the north of La Vacquerie, and on the left to the south of Marcoing, they penetrated and occupied two small salients in the British lines. In the morning of the following day, after a short but heavy bombardment, the Germans renewed their attack against Welsh Ridge on a front of about 1,200 yards south of Marcoing. The southern portion was assaulted by strong forces, and assisted by liquid fire they succeeded in gaining a foothold in one of the British trenches. The gain was only temporary, for the British quickly rallied, and in a fierce counterattack drove out the invaders and reoccupied the entire trench system. German artillery thundered unceasingly throughout the day on January 1, 1918, near La Vacquerie on the Cambrai front, and in the Lens, Armentières and Ypres sectors. In the evening, under cover of a heavy bombardment, three bodies of German troops attempted to raid British positions in the vicinity of Méricourt southeast of Lens. The assaulting troops came under the concentrated fire of the British artillery and were hurled back with heavy losses before they could reach their objectives. In no-man's-land these disorganized Germans ran into a British patrol, and again lost heavily, very few escaping from the field.