The artillery preparation began on 6 April and the infantry attack on Monday the 16th, a week after that on the Vimy Ridge. The battle was not easy to follow, because the French were very reserved about their reverses, and the maps gave an erroneous impression of the line from which the attack started and that on which it ended. The French were commonly thought to be holding both banks of the Aisne all the way from Soissons to Berry-au-Bac, whereas in reality they had never recovered from their retreat in January 1915 to the south bank between Missy and Chavotine. Nor, except at Troyon, were they near the Chemin des Dames; and not only had the river to be crossed, but the formidable slopes, which the Germans had beeen meticulously fortifying for two and a half years, to be surmounted. The results of the first day's onslaught fell lamentably short of the extravagant anticipations. The banks of the Aisne were cleared, some progress was made up the slopes, and from Troyon, where the original line was nearly on the ridge, an advance was made along it. But on the whole the Germans maintained their grip on the Chemin des Dames. Nor was fortune much kinder in the gap between it and the heights east of Reims. The French Tanks, here first employed, were disappointing, and Loivre was the only gain. The 17th was spent in beating off counter-attacks west of Reims, while the French offensive spread east to Moronvillers. Here the same tale had to be told; gallantry carried various points of importance, but a month's fighting failed to give the French complete control of their first day's objectives. West of Reims on the 18th and following days Nanteuil, Vailly, Laffaux, Aizy, Jouy, Ostel, and Bray were captured by Mangin, but they were all below the Chemin des Dames, and April came to an end with the road to Laon as impassable as ever. Fresh attempts were made in May; Craonne was taken on the 4th, and the California plateau to the north of it and Chevreux in the plain to the east were seized on the 6th and held against counter-attacks, while east of Reims Auberive had fallen, and by the 20th the whole summit of the Moronvillers massif was said to have been secured.