Answer:
Lack of experienced generals and lack of provision
Explanation:
The main problem for the patriots in the first years of the war was lack of provisions - clothes, weapon, food... Also, the army didn't had so many experienced generals. Most of the officers who served in the Revolutionary army were officers in the British army in the previous wars.
The main achievements during first two years of war were first victories in the war, including Preston and Trenton. Also, the key event was signing of Declaration of Independence, and also deliberation of some cities, including the port of Boston.
