Romans valued loyalty and discipline.
The life of a soldier during the civil war wasn't easy. Not only did soldiers face the possibility of getting killed in battle, their daily lives were full of hardships. They had to deal with hunger, bad weather, poor clothing, and even boredom between battles. Soldiers were woken at dawn to begin their day.
You didn't provide any reasons so it's hard to pick a specific answer. However, the reason why the colonists were extremely angry with Great Britain were the imposing of all these unnecessary taxes. There was the Tea Act, the Stamp Act, etc. All of these taxes were what drove the colonists crazy.
They were a strength to the Union. They carried soldiers and supplies to the battlefront much quicker, from a few months' march to a week. Having the supplies quicker to the battleground gave the Union the advantage over the Confederates, since the Union could recover much faster from any loss.
