As the Continental Army packed up its gear at Valley Forge, Washington instructed Lafayette to slow Clinton down by harrassing the British rear with a forward column of light troops.
"You are immediately to proceed with the detachment commanded by Genl Poor and form a junction as expeditiously as possible with that under the commanded of Genl Scott. You are to use the most effectual means for gaining the enemys left flank and rear, and giving them every degree of annoyance—all continental parties that are already on the lines will be under your command and you will take such measures in concert with Genl Dickinson as will cause the enemy most impediment & loss in their march—for these purposes you will attack them as occasion may require by detachment, and if a proper opening shd be given by operating against them with the whole force of your command. You will naturally take such precautions as will secure you against surprise—and maintain your communication with this army."
Gen. George Washington to Maj. Gen. Lafayette, 25 June 1778www.founders.archives.gov