Union soldiers were members of the military forces that fought for the Northern states during the American Civil War (1861-1865). They were part of the Union, which aimed to preserve the United States and oppose the secession of the Southern states. These soldiers came from various backgrounds and included volunteers and conscripts. The Union Army was known for its larger size compared to the Confederate forces. Soldiers wore blue uniforms and were often organized into regiments. They faced numerous challenges, including harsh conditions, battles, and the complexities of warfare, but played a crucial role in the eventual victory of the Union.