Bulow, it must be remembered, commanded no less than 32,000 men. The fatigues and difficulties attendant upon the progress of such a body, most of it tied to one road, will easily be appreciated.
During the afternoon of the 16th, while Ligny was being fought, he advanced the whole of this body to points immediately north and east of Gembloux. Not a man, therefore, of his great command had marched less than twenty miles, many must have marched over twenty-five, upon that Friday afternoon.
Then followed the night during which the other three defeated corps fell back upon Wavre.
That night was full of their confused but unmolested retreat. With the early morning of the Saturday Bulow’s 32,000 fell back along a line parallel to the general retirement, and all that day they were making their way by the cross-country route through Welhain and Corroy to Dion Le Mont.
This task was accomplished through pouring rain, by unpaved lanes and through intolerable mud, over a distance of close on seventeen miles for the hardest pushed of the troops, and not less than thirteen for those whom the accident of position had most spared.
The greater part of the Fourth Corps had spent the first night in the open; all of it had spent the second night upon the drenched ground. Upon the third day, the Sunday of Waterloo, this force, though it lies furthest from the field of Waterloo of all the Prussian forces, is picked out to march first to the aid of Wellington, because it as yet has had no fighting and is supposed to be “fresh.” On the daybreak, therefore, after bivouacking in that dreadful weather, Bulow’s force is again upon the move. It does not get through Wavre until something like eight o’clock, and the abominable conditions of the march may be guessed from the fact that its centre did not reach St Lambert until one o’clock, nor did the last brigade pass through that spot until three o’clock. Down the steep ravine of the Lasne and up on the westward side of it was so hard a business that, as we have seen, the brigades did not begin to debouch from the woods at the summit until after four o’clock. It was not until after five o’clock that the last brigade, the 14th, had come up in line with the rest upon the field of Waterloo, having moved, under such abominable conditions of slow, drenched marching, another fifteen miles.
In about forty-eight hours, therefore, this magnificent piece of work had been accomplished. It was a total movement of over fifty miles for the average of the corps—certainly more than sixty for those who had marched furthest—broken only by two short nights, and those nights spent in the open, one under drenching rain. The whole thing was accomplished without appreciable loss of men, guns, or baggage, and at the end of it these men put up a fight which was the chief factor in deciding Waterloo.
Such was the supreme effort of the Fourth Prussian Army Corps which decided Waterloo.
There are not many examples of endurance so tenacious and organisation so excellent in the moving so large a body under such conditions in the whole history of war.