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Disposition of the Four Prussian Corps on June 15th, 1815.
At dawn, then, the whole front of the French army was moving. It was the dawn of Thursday the 15th of June. By sunset of Sunday all was to be decided.
At this point it is essential to grasp the general scheme of the operations which are about to follow.
Put in its simplest elements and graphically, the whole business began in some such form as is presented in the accompanying sketch map.
Napoleon’s advancing army X Y Z, marching on Thursday, June 15th, strikes at O (which is Charleroi), the centre of the hundred-mile-long line of cantonments A B C——D E F, which form the two armies of the Allies, twice as numerous as his own, but thus dispersed. Just behind Charleroi (O) are a hamlet and a village, called respectively Quatre Bras (Q) and Ligny (P).