Some years ago, when constructing a Model of the Field of Waterloo, at a particular period of the Battle; I found it necessary to make great exertions to procure that detailed information for which I had sought in vain in the already numerous _published_ accounts of the military transactions of 1815. Anxious to ensure the rigorous accuracy of my work, I ventured to apply for information to nearly all the surviving Eye Witnesses of the incidents which my Model was intended to represent. In every quarter, and among Officers of all ranks, from the General to the Subaltern, my applications were responded to in a most liberal and generous spirit; and the result did indeed surprise me, so greatly at variance was this historical evidence with the general notions which had previously prevailed on the subject. Thus was suggested the _present_ Work. I was induced by the success of this experiment to embrace a wider field, and to extend my enquiries over the entire Battle; and, ultimately, throughout the Campaign itself, from its commencement to its close. Having become the depository of such valuable materials, I felt it a duty to the honourable profession of which I am a humble member, to submit to it, and to the World, a true and faithful account of this memorable epoch in the history of Britain's military greatness. Though not so presumptuous as to imagine that I have fully supplied so absolute a desideratum; yet I consider myself fortunate in being the instrument of withdrawing so far the veil from Truth. One of my Waterloo correspondents has humorously remarked, that "if ever truth lies at the bottom of a well, she does so immediately after a great Battle; and it takes an amazingly long time before she can be lugged out." The time of her emerging appears to have at length arrived; but, while I feel that I have brought to light much that was involved in obscurity, I cannot but be sensible that I may have fallen into errors. Should such be the case, I shall be most ready, hereafter, to make any corrections that may appear requisite, on my being favoured, by _Eye Witnesses_, with further well authenticated information. I take this opportunity of returning my sincere thanks to the numerous Officers of the British Army, who have so kindly committed to my keeping their recollections of the events which I have attempted to describe. Similar thanks are likewise due to the Officers of the King's German Legion and Hanoverian Subsidiary Corps; as also to the General Officers who respectively furnished me with such information as related to the troops of Brunswick and Nassau. I beg also to express my obligations to the Prussian Minister of War, and the Officers of the Prussian General Staff in Berlin, for the readiness and liberality with which they have supplied me with such details concerning the dispositions and movements of the troops of their Sovereign, as were essential to me in prosecuting the task I had undertaken.