Answer:
The Battle of Fort Donelson was the first major Union victory in the Civil War and a major victory for Ulysses S. Grant. The losses of Fort Henry and Fort Donelson were disasters for the Confederates. Kentucky was lost and Tennessee lay wide open to the Yankees.
It occurred in I Hardin County in southwestern Tennessee. The Union won the battle. The Union had about 13,000 casualties and the Confederates had about 11,000. The Armies of Tennessee and Ohio outnumber the Army of Mississippi by about 20,000 men.
Step-by-step explanation: