Ludendorff erred by attacking the British first in 1918, instead of the French. He mistakenly thought the British to be too uninspired to respond rapidly to the new tactics. The exhausted, dispirited French perhaps might have folded. The German assaults on the British were ferocious—the largest of the entire war. At the Somme River in March, 63 divisions attacked in a blinding fog. No matter, the German lieutenants had memorized their maps and their orders. The British lost 270,000 men, fell back 40 miles, and then held. They quickly learned how to handle the new German tactics: fall back, abandon the trenches, let the attackers overextend themselves, and then counterattack. They gained an advantage in firepower from their artillery and from tanks used as mobile pillboxes that could retreat and counterattack at will. In April Ludendorff hit the British again, inflicting 305,000 casualties—but he lacked the reserves to follow up. Ludendorff launched five great attacks between March and July, inflicting a million British and French casualties. The Western Front now had opened up—the trenches were still there but the importance of mobility now reasserted itself. The Allies held. The Germans suffered twice as many casualties as they inflicted, including most of their precious stormtroopers. The new German replacements were under-aged youth or embittered middle-aged family men in poor condition. They were not inspired by the elan of 1914, nor thrilled with battle—they hated it, and some began talking of revolution. Ludendorff could not replace his losses, nor could he devise a new brainstorm that might somehow snatch victory from the jaws of defeat. The British likewise were bringing in reinforcements from the whole Empire, but since their home front was in good condition, and since they could see inevitable victory, their morale was higher. The great German spring offensive was a race against time, for everyone could see the Americans were training millions of fresh young men who would eventually arrive on the Western Front.