Explanation:
The American Continental Army camped in Valley Forge during the winter of 1777–78. This was here that the US military became a true war unit. Valley Forge is also called the American Army's birthplace.
George Washington chose Valley Forge because it was near Philadelphia where the British camped for the winter. When the Army was invaded, Valley Forge was a safe place to defend. There were high areas for making fortifications in Mount Joy and Mount Misery. There was also a river to the north, the Schuylkill River, which acted as a barrier.
