Some troubles that the North faced were copperheads, people in the North who sympathized with the South and fought against the Civil War, the Union having difficulty getting people to volunteer to fight and having to draft soldiers, and the thought that the war would only last a short time, which made it more difficult to adjust to the long four years ahead of them. A factor that proved to harm the Union was that the Northern army was very untrained, although it was large. The biggest trial the Union faced was that they had to invade, conquer, and occupy the South, while the Confederacy was fighting a defensive war, meaning they only had to defend their territory long enough to make the Union stop attacking. Furthermore, the Union had to completely destroy the South's will to resist by forcing a surrender, which is no easy feat in any war.