TO THE MARQUIS DE LAFAYETTE. (ORIGINAL—INSTRUCTION.)~{1}

SIR,—The detachment under your command, with which you will immediately march towards the enemy's lines, is designed to answer the following purposes; namely, to be a security to this camp, and a cover to the country, between the Delaware and the Schuylkill, to interrupt the communication with Philadelphia, to obstruct the incursions of the enemy's parties, and to obtain intelligence of their motions and designs. This last is a matter of very interesting moment, and ought to claim your particular attention. You will endeavour to procure trusty and intelligent spies, who will advise you faithfully of whatever may be passing in the city, and you will, without delay, communicate to me every piece of material information you obtain. A variety of concurring accounts make it probable that the enemy are preparing to evacuate Philadelphia; this is a point of the utmost importance to ascertain, and, if possible, the place of their future destination.

Should you be able to gain certain intelligence of the time of their intended embarkation, so that you may be able to take advantage of it, and fall upon the rear of the enemy in the act of withdrawing, it will be a very desirable event; but this will be a matter of no small difficulty, and will require the greatest caution and prudence in the execution. Any deception or precipitation may be attended with the most disastrous consequences. You will remember that your detachment is a very valuable one, and that any accident happening to it would be a severe blow, to this army; you will, therefore, use every possible precaution for its security, and to guard against a surprise. No attempt should be made, nor anything risked, without the greatest prospect of success, and with every reasonable advantage on your side. I shall not point out any precise position to you, but shall leave it to your discretion to take such posts occasionally, as shall appear to you best adapted to the purposes of your detachment. In general, I would observe, that a stationary post is unadvisable, as it gives the enemy an opportunity of knowing your situation, and concerting plans successfully against you.

In case of any offensive movement against this army, you will keep yourself in such a state as to have an easy communication with it, and, at the same time, harass the enemy's advance.

Our parties of horse and foot, between the rivers, are to be under your command, and to form part of your detachment. As great complaints have been made of the disorderly conduct of the parties which have been sent towards the enemy's lines, it is expected that you will be very attentive in preventing abuses of the like nature, and will inquire how far complaints already made are founded in justice.

Given under my hand, at head quarters, this 18th May, 1778.

Endnote:

1. This instruction has been inserted as the one which M. de Lafayette received to repair, as a detached body, betwixt the Delaware and Schuylkill. It was after this movement that he made the retreat of Barren Hill, which was praised by General Washington. (See the Memoirs, in Mr. Spark's collection, the letter Of Washington, May 24th, 1778.)