It was Sunday, the 28th of June, 1778, a day which has come down in history, not only because of the battle which marks its date, but because of its scorching heat. The mercury stood near the 100 mark, and man and beast were well-nigh overcome.
History tells us that the British had remained at Philadelphia until early in June, when they had evacuated that city and crossed the Delaware River on June the eighteenth, with an intention to march across New Jersey to New York. Having heard of this movement of the British, General Washington, with a force nearly equal to that of the enemy, also crossed into New Jersey, with the purpose of retarding the British march and, if opportunity offered, bring on a general engagement. By the 22d of June the whole of the American force was massed on the east bank of the Delaware in a condition and position to give the enemy battle. Despite some opposition on the part of General Lee and other officers, Lafayette and Greene agreed with General Washington in his opinion that the time to strike had come, and soon orders were given which led to the battle of Monmouth.
Lafayette was detached with a strong body of troops to follow up the British rear and act, if occasion presented. Other riflemen and militia were in advance of him and on his flanks, making a strong body of picked troops. To protect his twelve-mile baggage-train from these troops, Sir Henry Clinton placed them with a large escort under Knyphausen, while he united the rest of his force in the rear to check the enemy, if they came too close. The distance between Knyphausen's force and that which brought up the rear suggested the idea to Washington to concentrate his assault on the rear force, and to hasten the attack before the British should reach the high ground of Middletown, about twelve miles away, where they would be comparatively safe.
At once General Lee was sent forward to join Lafayette, with instructions to engage the enemy in such action as was possible until the remainder of the troops should arrive. Lee carried out his part of the command in such a half-hearted way as to bring severe censure on him later, and when General Greene arrived on the scene of action, Lee and his men were in retreat.