Place where washington's colonial army camped in the winter of 1777-1778 the army had to endure extreme weather and hardship to continue the revolution

The answer is Valley Forge. This was the military campground 18 miles (29 km) northwest of Philadelphia where the American Continental Armed forces spent the winter time of 1777-78 throughout the American Revolutionary War. Hunger, illness, undernourishment, and contact killed more than 2,500 American militaries by the end of February 1778.