[506] Hamley contends that the injunction to Grouchy—which, by the way, is contained in both the written and the verbal orders,—to communicate with Napoleon by the Namur-Quatre Bras turnpike, is not consistent with a movement towards Wavre. But why should not this arrangement have been prescribed for the sake of greater safety? If the Prussians were moving towards Wavre and the Dyle, their cavalry might be expected to make all communication across the country very hazardous for couriers or staff-officers. And, as a matter of fact, it was by the Brussels turnpike to Quatre Bras, thence by the Namur turnpike to Sombreffe, and thence _via_ Gembloux to Grouchy’s position in front of Wavre, that Napoleon sent Grouchy the two orders on the day of the battle. Napoléon à Waterloo, pp. 277, 278. [507] Hooper, p. 153. [508] Charras, vol. 1, pp. 241, 242. [509] Assuming, that is, that it was wise in Napoleon to detach Grouchy with his two corps from the main army after he had reason to apprehend that the Prussians might be intending to unite with the English. See the Notes to Chapter XV; _post_, pp. 273 _et seq._ [510] Maurice, p. 348: July, 1890. [511] Ib., p. 353. [512] Ib., pp. 350-355. CHAPTER XIV. THE SEVENTEENTH OF JUNE: BLÜCHER AND WELLINGTON. Zieten and Pirch I. fell back after the battle of Ligny, as has been above stated,[513] in the direction of Wavre. Gneisenau, the chief-of-staff of the Prussian army, on whom, in the absence of Marshal Blücher, who was unhorsed and quite seriously bruised in a cavalry encounter at the end of the day, and was supposed to have been taken prisoner,[514] the command devolved, gave the order at first for the two beaten corps[515] to retire on Tilly, and then, as one of his staff-officers called his attention to the fact that Tilly was not on all the maps, he substituted Wavre for Tilly as the point to be reached.[516] This step involved obviously the renunciation of the line of Namur. It implied also that the IIId and IVth Corps, those of Thielemann and Bülow, would be ordered to retire in the general direction of Wavre, so that a union of the whole army might be effected somewhere to the northward. But it did not necessarily imply that this union of the army would be effected at Wavre; or even that, if effected at Wavre, it would be followed by an attempt to unite with the Anglo-Dutch army. It was quite possible that the two beaten corps might, after reforming at Wavre, be ordered in the direction of Maestricht, towards which place the IIId and IVth Corps might also be ordered to retire. In fact, this was the interpretation put by General Thielemann on the facts as he first learned them. He wrote to Bülow,[517] that he had heard nothing from the Marshal, but supposed that the intention was that the Ist and IId Corps were to fall back from Wavre towards St. Trond, which is a town in the direction of Maestricht, some 35 miles from Wavre.