Which was a problem for the British army at the beginning of the American Revolution?

ummm....the cold, the loyalists, and lacking navy, troops, and supplies

(Improved Answer)

The Challenges (disadvantages) that the revolutionist faced is the fact that from the beginning of the war the British had an overwhelming advantage, they had the strongest Navy in the world. They also had, experienced, well trained Soldiers. And the wealth of a worldwide empire. Great Britain also had more than double the population of The United States, at eight-million citizens, compared to 2.5 million.

The Colonists, however suffered serious disadvantages. They lacked a "regular army" and a strong navy. American Soldiers also lacked experience and proper training. The Colonist' supply of Weapons and Ammunition was another problem that has to be dealt with.

The Patriots had another obstacle. Not all the Americans supported the struggle for independence, these were called Loyalists, and would serve as a vast difficulty for the Patriots, and would often stand in the way.