In May 1778, while the British main army was in Philadelphia, and the American troops at Valley Forge, he was detached with about two thousand five hundred men under his command, to a position in advance of the continental camp and near the city, for the purpose of watching the motions of the enemy. The British endeavored to surround and surprise him: but he had timely notice of their plan, and retired in safety to the vicinity of WASHINGTON'S head-quarters. Had he been surprised in this situation, the result would probably proved fatal to our cause. For the continental troops under WASHINGTON were few in number and poorly clothed and armed. But the Commander in Chief, doubtless, was fully aware of the important and critical nature of the service, and entrusted it to one, in whose judgment as well as bravery he had perfect confidence.
Soon after this, in the month of June, the British army left Philadelphia, to return to New-York. It consisted of as large a number of well disciplined troops, as they had in America at any one time; and though they chose not to make a direct attack upon WASHINGTON, they seem to have had no apprehensions of an attack from him. But he was resolved to avail of the occasion of their march through the State of New Jersey, to attack and annoy them. This he did on the memorable 28th of June, near Monmouth court-house; and had his judicious plan been faithfully executed, or his own personal activity and bravely been seconded by General LEE, who had the command of the troops more immediately engaged on that day, a great and decisive victory would in all probability have attended the daring enterprize. General LAFAYETTE had a distinguished command on that critical day. Lee, indeed, at first declined the command of the advanced corps, detached by WASHINGTON to harass the rear of the enemy while on their march; and it was given to the former: though; afterwards, when it was found, that the enemy was preparing for a general engagement, a reinforcement was ordered, and the whole placed under the command of General Lee. In this whole affair, General LAFAYETTE conducted with remarkable intelligence and bravery; and received the entire approbation of the Commander in Chief.
In August of the same year (1778) when the enemy had a large force on Rhode Island, and were supposed to be meditating an attack on some place in the vicinity, Lafayette (with General Greene) offered his services as a volunteer. The expedition was not attended with success: the British troops then were more numerous than we could collect against them; and what were mustered were principally militia. The continental regiments were then all needed near New-York. But General Lafayette assisted in conducting the retreat of our men, with much skill and effect; and his behaviour on the occasion received the particular notice and approbation of Congress.
About this time, with the knowledge and consent of Congress, Lafayette made a visit to Boston. The particular object of this journey is not known. It is evident, however, from the resolve of Congress on the occasion, that it was not from merely personal or private views. It was, no doubt, for some purpose of a public nature, and for the welfare of the nation. The following is the resolve alluded to; and is proof, that his visit at the time, was designed for the promotion of some plan calculated for the prosperity of the country.
"In Congress, Sept. 9th, 1778. Resolved, That the President be requested to inform the Marquis de Lafayette, that Congress have a due sense of the sacrifice he made of his personal feelings, in undertaking a journey to Boston with a view of promoting the interests of these States, at a time when an occasion was daily expected of his acquiring glory in the field; and that his gallantry in going a volunteer on Rhode Island, when the greatest part of the army had retreated, and his good conduct in bringing off the pickets and out sentries, deserves particular approbation." This resolve was communicated to Lafayette by the President of Congress, with a polite note; to which the Marquis replied as follows:
"SIR,
"I have received your favour of the 13th instant, acquainting me of the honor Congress has been pleased to confer on me by their most gracious resolve. Whatever pride such approbation may justly give me, I am not less affected by the feeling of gratitude, and that satisfaction of thinking my endeavours were ever looked upon as useful to a cause in which my heart is so deeply interested. Be so good, Sir, as to present to Congress my plain and hearty thanks, with a frank assurance of a candid attachment, the only one worth being offered to the representatives of a free people. The moment I heard of America, I loved her: The moment I knew she was fighting for liberty, I burnt with the desire of bleeding for her: and the moment I shall be able of serving her, in any time, or in any part of the world, will be the happiest of my life. I never so much wished for occasions of deserving those obliging sentiments I am honored with by these States and their representatives, and that so flattering confidence they have been pleased to put in me; which have filled my heart with the warmest acknowledgments and most eternal affection.
"I pray you to accept my thanks for the polite manner in which you have communicated the resolve of Congress; and I have the honor to be, &c.
"LAFAYETTE."
During the year 1778, some propositions were made to Congress from the British ministry, through three commissioners, who were sent over to America. The object was to bring about a cessation of hostilities, and peace, without acknowledging our Independence. They were, therefore, immediately rejected. In the address of the commissioners to Congress, the French King and ministers were mentioned with great disrespect, and represented as secret enemies to America; and therefore, not to be believed in their engagements and promises in our favour. The Marquis de Lafayette highly resented this heavy charge against his king and government; and wrote a very spirited letter on the subject, to Lord Carlisle, the principal commissioner. He seemed ready to appear as the champion of his abused Prince and country, in the chivalrous manner such attacks were met in former ages, when disputes were settled between nations by single combat. The indignation he expressed was honorable to his patriotic feelings; but, probably, his maturer years and judgment would have chastened and moderated it.