Answer: Disease, a harsh winter, and lack of food.
Step-by-step explanation:
Soldiers at Valley Forge faced terrible conditions. In addition to the cold and wet weather, worsened by the lack of warm clothes, food was extremely scarce so they had to endure hunger. Furthermore, the cold and packed shelters allowed diseases such as typhoid fever, pneumonia, and smallpox to spread fast, taking the lives of many of them.