To avoid these calamities it was determined to take a strong position in the neighborhood of Philadelphia, equally distant from the Delaware above and below that city, and there to construct huts in the form of a regular encampment which might cover the army during the winter. A strong piece of ground at Valley Forge, on the west side of the Schuylkill between twenty and thirty miles from Philadelphia, was selected for that purpose, and some time before day on the morning of the 11th of December (1777) the army marched to take possession of it. By an accidental concurrence of circumstances Lord Cornwallis had been detached the same morning at the head of a strong corps on a foraging party on the west side of the Schuylkill. He had fallen in with a brigade of Pennsylvania militia commanded by General Potter which he soon dispersed, and, pursuing the fugitives, had gained the heights opposite Matron's ford, over which the Americans had thrown a bridge for the purpose of crossing the river, and had posted troops to command the defile called the Gulph just as the front division of the American army reached the bank of the river. This movement had been made without any knowledge of the intention of General Washington to change his position or any design of contesting the passage of the Schuylkill, but the troops had been posted in the manner already mentioned for the sole purpose of covering the foraging party. Washington apprehended from his first intelligence that General Howe had taken the field in full force. He therefore recalled the troops already on the west side and moved rather higher up the river for the purpose of understanding the real situation, force, and designs of the enemy. The next day Lord Cornwallis returned to Philadelphia, and in the course of the night the American army crossed the river. Here the Commander-in-Chief communicated to his army in general orders the manner in which he intended to dispose of them during the winter. He expressed in strong terms his approbation of their conduct, presented them with an encouraging state of the future prospects of their country, exhorted them to bear with continuing fortitude the hardships inseparable from the position they were about to take, and endeavored to convince their judgments that those hardships were not imposed on them by unfeeling caprice, but were necessary for the good of their country. The winter had set in with great severity, and the sufferings of the army were extreme. In a few days, however, these sufferings were considerably diminished by the erection of logged huts, filled up with mortar, which, after being dried, formed comfortable habitations, and gave content to men long unused to the conveniences of life. The order of a regular encampment was observed, and the only appearance of winter quarters was the substitution of huts for tents.