There I saw a French officer come out of a low copse close by, and instantly fired at him, but without doing him any mischief. He made his way up the hill as quickly as possible, using his sword as a walking-stick, but a German rifleman who had been on the look-out cut off his communication and succeeded in taking him prisoner. I did not take any further notice of him, therefore, but proceeded along with my company still in pursuit of the French, who were retreating in all directions in a very disorderly state.

We might have taken hundreds of them prisoners had it not been for our officers, who in their flurry had mistaken them for Spaniards; for Lord Wellington had previously ordered the Spaniards to wear a piece of white substance round their left arm to make some distinction between the French dress and theirs, which was very similar; but the French had got knowledge of this, and a great number of them, who were obliged in their hurried retreat and on account of the difficulties of the road to pass near our lines, had adopted the Spanish white band. Still we fired at them both with muskets and artillery; but when the officers perceived the white on their arms, without bestowing any more consideration as to whether they were the enemy or the Spaniards, they immediately stopped us from doing so. As soon as the French in passing observed this, they sunk into the valley and piled arms as if they were allies; and directly an opportunity afforded itself, they again took up their muskets and fired right into our lines, doing terrible mischief.

The Autobiography of Sergeant William Lawrence — Part 68

I never in all the days of the campaign saw men in such a rage as ours were with the officers. I really thought that some serious consequences would ensue, but as it was, all fortunately passed off as well as could be expected after such a mistake. For if this trick had before been observed, we might have taken the whole body prisoners by a direct movement of our right flank, as no other way lay open to their retreat without their encountering great difficulties; but the chance was now thrown away, and repairs could not be made of the damage done; many in our line having lost their irrecoverable lives, and others being more or less injured. We had only to make what consolation we could from beholding the almost express pace of the party as it retreated from where lay our comrades, either as groaning, wounded, or shattered corpses.

The Autobiography of Sergeant William Lawrence — Part 68