Battle of Fort Henry

The Battle of Fort Henry was fought on February 6, 1862, in Donelson, Stewart County, Tennessee, during the American Civil War. It was the first important victory for the Union and Brig. Gen. Ulysses S. Grant in the Western Theater.
On February 4 and 5, Grant landed two divisions just north of Fort Henry on the Tennessee River. (The troops serving under Grant were the nucleus of the Union's successful Army of the Tennessee, although that name was not yet in use ) Grant's plan was to advance upon the fort on February 6 while it was being simultaneously attacked by Union gunboats commanded by Flag Officer Andrew Hull Foote. A combination of accurate and effective naval gunfire, heavy rain, and the poor siting of the fort, nearly inundated by rising river waters, caused its commander, Brig. Gen. Lloyd Tilghman, to surrender to Foote before the Union Army arrived.
On the morning of February 6, Foote's seven Union gunboats arrived at Fort Henry and established their position around 12:30 p.m. They soon opened fire from a distance at 1,700 yards (around 1,554 meters), beginning an exchange of gunfire with Fort Henry that continued for over an hour. After Tilghman rejected an initial call to surrender, the fleet continued to bombard the fort. This was its first engagement using newly designed and hastily constructed ironclads. Foote deployed the four ironclad gunboats in a line abreast, followed by the three timberclads, under the command of Seth Ledyard Phelps, which were held back for long-range, but less effective fire against the fort. The high water level of the river and the low elevation of Fort Henry's guns allowed Foote's fleet to escape serious destruction. The Confederate fire was able to hit the ironclads only where their armor was strongest. During the bombardment, all four of the Union ironclads were repeatedly hit by Confederate fire. The USS Essex was seriously damaged when a 32-pound shot from Fort Henry penetrated the ironclad, hitting the middle boiler and sending scalding steam through half the ship. Thirty-two crewmen were killed or wounded, including commander William D. Porter. The ship was out of action for the remainder of the campaign.
The surrender of Fort Henry opened the Tennessee River to Union traffic south of the Alabama border. In the days following the fort's surrender, from February 6 through February 12, Union raids used ironclad boats to destroy Confederate shipping and railroad bridges along the river. On February 12, Grant's army proceeded overland 12 miles (19 km) to engage with Confederate troops in the Battle of Fort Donelson.
https://en.wikipedia.org/wiki/Battle_of_Fort_Henry