This hint was sufficient for the keen-witted marquis, who answered: “I am of the opinion, with you, that I had better remain in Virginia. I have pretty well understood you, my dear General, but should be happy to have more minute details, which, I am aware, cannot be intrusted to letters.”

La Fayette also wrote to his wife: “It was not prudent in the general to confide to me such a command. If I had been unfortunate, the public would have called that partiality an error of judgment.”

But Washington well knew the character and capacity of the young marquis, and trusted him probably more than his older and more experienced generals. La Fayette had already proved that his courage would never lead him to make rash ventures, but when hazardous enterprises were necessary, no danger could unnerve him, and no unexpected dilemma could confuse him.

On the 30th of August the French fleet under Count de Grasse arrived. The Marquis de Saint-Simon landed with three thousand men, and La Fayette joined his force to them and took up a strong position at Williamsburg. Washington having completely outwitted General Clinton, by feigning an intended attack on New York, had started on the 19th of August, with the entire American army, and, crossing the Hudson, they began their march to Virginia.

In announcing their departure to La Fayette, Washington wrote to the marquis, enjoining upon him the closest watchfulness, lest the enemy should escape his vigilance, adding: “As it will be of great importance towards the success of our present enterprise that the enemy, on the arrival of the fleet, should not have it in their power to effect retreat, I cannot omit to repeat to you my most earnest wish that the land and naval forces which you will have with you may so combine their operations that the British army may not be able to escape. The particular mode of doing this I shall not, at this distance, attempt to dictate. Your own knowledge of the country, from your long continuance in it, and the various and extensive movements which you have made, have given you great opportunities for observation, of which I am persuaded your military genius and judgment will lead you to make the best improvement. You will, my dear Marquis, keep me constantly advised of every important event respecting the enemy or yourself.”

Cornwallis, who had taken his position at York and Gloucester, where he had been actively engaged in erecting heavy fortifications, now suddenly found himself completely surrounded by his foes, being blockaded by sea and land, with hardly a possibility of escape. He sent an urgent request to Sir Henry Clinton for succor, and finding, after having carefully reconnoitred La Fayette’s position at Williamsburg, that any attempt to pass it and retreat to the South would be useless, he awaited with impatience his expected re-enforcements.

La Layette’s loyalty to Washington and his faithful obedience was at this time severely tried. As the Count de Grasse had permission to serve on the American coast only until the middle of October, and as he and the Marquis St. Simon were anxious to distinguish themselves, they urged La Fayette to make an immediate attack upon the enemy, without awaiting the arrival of Washington and the Count de Rochambeau. “It is right,” they argued, “that you who have had all the difficulties of this campaign should now be rewarded with the glory of its successful termination.” They represented that the incomplete state of the fortifications of Cornwallis made his defeat sure, as he could not resist a sudden attack. These were powerful reasons to the young and impulsive marquis; but his loyalty and better judgment prevailed, and he resisted all appeals to commence the attack, and waited in patience the arrival of Washington and Rochambeau.

On the 14th of September Washington and Rochambeau arrived at Williamsburg, and La Fayette was rejoiced to behold the consummation of one of his fondest wishes, which was to see Washington at the head of the united French and American armies. Plans were immediately completed for the siege of Yorktown. Washington highly approved of all the measures adopted by La Fayette, and a brilliant success seemed certain.

But a new difficulty unexpectedly arose, which was only removed by the persuasive influence of La Fayette. Information reached the French admiral that the British fleet in New York had received important additions, and he thereupon determined to sail directly against the English fleet. Washington perceived that if they were deserted by the French fleet, their victory over Cornwallis might be very uncertain. He accordingly wrote a letter to Count de Grasse, and sent it by La Fayette, urging the marquis to use his personal influence to prevent this calamity. La Fayette realized the crisis of affairs, and successfully appealed to the count; and the French fleet therefore remained to aid the American army.

The troops from the North having arrived on the 28th, the entire army, moving forward in four columns, halted about twelve miles in front of the enemy, and the famous siege of Yorktown was begun.