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It was eleven o’clock on the morning of that Friday the 16th before Ney sent a definite order to Reille to march; it was twelve before the head of that Second Army Corps set out up the great road to cover the four or five miles that separated them from Ney’s headquarters at Frasnes. Erlon, lying next behind Reille, could not advance until Reille’s last division had taken the road. So Erlon, with the First Army Corps, was not in column and beginning his advance with his head troops until after one o’clock.

At about half-past one, then, we have the first troops of Reille’s army corps reaching Ney at Frasnes, its tail-end some little way out of Gosselies; while at the same hour we have Erlon’s First Army Corps marching in column through Gosselies.

It would have been perfectly possible, at the expense of a little fatigue to the men, to have had the Second Army Corps right up at Frasnes and in front of it and deployed for action by nine o’clock, while Erlon’s army corps, the First, coming behind it as a reserve, an equal body in numbers, excellence, and order, would have taken the morning to come up. In other words, Ney could have had more than 20,000 men ready for the attack on Quatre Bras by mid-morning, with as many men an hour or two behind them, and ready on their arrival to act as a reserve. As a matter of fact, he waited with his single battalion and a few horsemen at his headquarters at Frasnes, only giving the orders we have seen, which did not bring Reille’s head columns up to him till as late as half-past one. It was well after two o’clock before Reille’s troops had deployed in front of Frasnes and this Second Army Corps were ready to attack the position at Quatre Bras, which Ney still believed to be very feebly held. The other half of Ney’s command, the First Army Corps, under Erlon, was still far away down the road.

This said, it behoves us to consider the strategical value of the Quatre Bras position, and later to see how far Ney was right in thinking that it was still quite insufficiently furnished with defenders, even at that late hour in the day.

Armies must march by roads. At any rate, the army marching by road has a vast advantage over one attempting an advance across country; and the better kept-up the road the greater advantage, other things being equal, has the army using it over another army debarred from its use.

Quatre Bras is the cross-way of two great roads. The first road is that main road from north to south, leading from the frontier and Charleroi to Brussels; along this road, it was Napoleon’s ultimate intention to sweep, and up this road he was on that morning of the 16th sending Ney to clear the way for him. The second road is the great road east and west from Nivelles to Namur, which was in June 1815 the main line of communication along which the two halves of the Allies could effect their junction.

The invader, then, when he held Quatre Bras, could hold up troops coming against him from the north, troops coming against him from the east, or troops coming against him from the west. He could prevent, or rather delay, their junction. He would have stepped in between.

But Quatre Bras has advantages greater than this plain and elementary strategical advantage. In the first place, it dominates the whole countryside. A patch or knoll, 520 feet above the sea, the culminating point of the plateau, is within a few yards of the cross-roads. Standing there, a few steps to the west of the highway, you look in every direction over a rolling plain, of which you occupy the highest point for some miles around.

Now, this position of the “Quatre Bras” or “Cross Roads” can be easily defended against a foe coming from the south, as were the two corps under Ney. In 1815 its defence was easier still.