1862 battle of the American Civil War in Tennessee
The Battle of Fort Henry was fought on February 6, 1862, in 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.
The surrender of Fort Henry opened the Tennessee River to Union traffic upriver through and along West Tennessee to a point 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 to engage with Confederate troops in the Battle of Fort Donelson.
Background.
In early 1861 the critical border state of Kentucky had declared neutrality in the American Civil War. This neutrality was first violated on September 3, when Confederate Brig. Gen. Gideon J. Pillow, acting on orders from Maj. Gen. Leonidas Polk, occupied Columbus, Kentucky, which overlooked strong defensive bluffs, to defend the Mississippi from Federal offensive action and was the terminus of the Memphis &amp; Ohio railroad, which in turn leads southwards to the extremely important Charleston &amp; Memphis railroad. The riverside town was situated on high bluffs that commanded the river at that point, where the Confederates installed 140 large guns, underwater mines and a heavy chain that stretched a mile across the Mississippi River to Belmont, while occupying the town with 17,000 Confederate troops, thus cutting off northern commerce to the south and beyond.
Two days later, Union Brig. Gen. Ulysses S. Grant, displaying the personal initiative that would characterize his later career, seized Paducah, Kentucky, a major transportation hub of rail and port facilities at the mouth of the Tennessee River. Henceforth, neither adversary respected Kentucky's proclaimed neutrality, and the Confederate advantage was lost. The buffer zone that Kentucky provided between the North and the South was no longer available to assist in the defense of Tennessee. 
By early 1862, a single general, Albert Sidney Johnston, commanded all the Confederate forces from Arkansas to the Cumberland Gap, but his forces were spread too thinly over a wide defensive line. Johnston's left flank was Polk, in Columbus with 12,000 men; his right flank was Brig. Gen. Simon Bolivar Buckner, in Bowling Green, Kentucky, with 4,000 men; the center consisted of two forts, Forts Henry and Donelson, under the command of Brig. Gen. Lloyd Tilghman, also with 4,000 men. Forts Henry and Donelson were the sole positions defending the important Tennessee and Cumberland Rivers, respectively. If these rivers were opened to Union military traffic, two direct invasion paths would lead into western &amp; eastern Tennessee, and the vital Memphis &amp; SC Railroad and more.
The Union military command in the West suffered from a lack of unified command, and were organized into three separate departments: the Department of Kansas, under Maj. Gen. David Hunter; the Department of Missouri, under Maj. Gen. Henry W. Halleck; and the Department of the Ohio, under Brig. Gen. Don Carlos Buell. By January 1862, the disunity was apparent because they could not agree on a strategy for operations in the Western Theater. Buell, under political pressure to invade and hold pro-Union eastern Tennessee, moved slowly in the direction of Nashville. In Halleck's department, Grant moved up the Tennessee River to divert attention from Buell's intended advance, which did not occur. Halleck and the other generals in the West were coming under political pressure from President Abraham Lincoln to participate in a general offensive by Washington's birthday (February 22). Despite his tradition of caution, Halleck eventually reacted positively to Grant's proposal to move against Fort Henry. Halleck hoped that this would improve his standing in relation to his rival, Buell. Halleck and Grant were also concerned about rumors that Confederate General P.G.T. Beauregard would soon arrive with 15 Confederate regiments. On January 30, 1862, Halleck authorized Grant to take Fort Henry.
Grant wasted no time, leaving Cairo, Illinois, at the confluence of the Mississippi and Ohio Rivers, on February 2. His invasion force, which arrived on the Tennessee River on February 4 and 5, consisted of 15,000–17,000 men in two divisions, commanded by Brig. Gens. John A. McClernand and Charles F. Smith, supported by the Western Gunboat Flotilla, commanded by United States Navy Flag Officer Andrew Hull Foote. The flotilla included four ironclad gunboats (flagship , USS "Carondelet", USS "St. Louis", and USS "Essex") under Foote's direct command, and three timberclad gunboats (USS "Conestoga", USS "Tyler", and USS "Lexington") under Lt. Seth Ledyard Phelps. Insufficient transport ships this early in the war to deliver all of the army troops in a single operation required two trips upriver to reach the fort. General Johnston was pressured by the confederate government to defend the Cumberland &amp; Tennessee and the important railroads in the region, to which end he converged all his forces further south, facing Buell's forces at the Cumberland Gap passes. His subordinate Beauregard incessantly protested at his defensive strategy, urging him to advance and meet the unionist offensive, or at least reinforce the fortifications on the rivers. Johnston refused, leaving a substantial force to guard Fort Donelson. Fort Henry was considered a liability due to its poor position &amp; engineering which made it highly susceptible to being flooded during high tide and rain, and was garrisoned by a token force of 3,000-4,000 including the crews for the heavy guns, which was considered adequate for defending against enemy naval attack, in the meantime a new fort was being constructed on better ground upriver.
Fort Henry.
Fort Henry was a five-sided, open-bastioned earthen structure covering on the eastern bank of the Tennessee River, near Kirkman's Old Landing. The site was about one mile above Panther Creek and about six miles below the mouth of the Big Sandy River and Standing Rock Creek.
In May 1861, Isham G. Harris, the governor of Tennessee, appointed the state's attorney, Daniel S. Donelson, as a brigadier general and directed him to build fortifications on the rivers of Middle Tennessee. Donelson found suitable sites, but they were within the borders of Kentucky, still a neutral state at that time. Moving upriver, just inside the Tennessee border, Donelson selected the site of the fort on the Cumberland River that would bear his name. Colonel Bushrod Johnson of the Tennessee Corps of Engineers approved of the site.
As construction of Fort Donelson began, Donelson moved west, to the Tennessee River, and selected the site of Fort Henry, naming it after Tennessee Senator Gustavus Adolphus Henry Sr. With Fort Donelson on the west bank of the Cumberland, Donelson selected the east bank of the Tennessee for the second fort so one garrison could travel between them and defend both positions. (Donelson thought it unlikely that the two forts would be attacked simultaneously.) Unlike its counterpart on the Cumberland, Fort Henry was situated on low, swampy ground and dominated by hills across the river. This oversight developed into frequent flooding of the fort during rains or high tide, on some occasions more than half of the fort was underwater after rain, including most of its armory. To its advantage, it had an unobstructed field of fire downriver. Donelson's surveying team—Adna Anderson, a civil engineer, and Maj. William F. Foster from the 1st Tennessee Infantry—objected strongly to the site and appealed to Colonel Johnson, who inexplicably approved it.
The fort was designed to stop traffic on the river, not to withstand large-scale infantry assaults that armies would use during the war. Construction began in mid-June, using men from the 10th Tennessee Infantry and slaves. The first cannon was test fired on July 12, 1861. After this flurry of activity, the remainder of 1861 saw little action because forts on the Mississippi River had a higher priority for receiving men and artillery. General Polk also neglected Forts Henry and Donelson in favor of defending Columbus, Kentucky. In late December, additional men from the 27th Alabama Infantry arrived along with 500 slaves to construct a small fortification across the river on Stewart's Hill, within artillery range of Fort Henry, and named it Fort Heiman. In January 1862, Brig. Gen. Lloyd Tilghman assumed command of both Forts Henry and Donelson, with a combined force of 4,900 men. At Fort Henry, approximately 3,000–3,400 men in two brigades were commanded by Colonels Adolphus Heiman and Joseph Drake. The men were armed primarily with antique flintlock rifles from the War of 1812.
Seventeen guns were mounted in Fort Henry by the time of the battle, eleven covering the river and the other six positioned to defend against a land attack (18-pounder smoothbores). There were two heavy guns, a Columbiad and a 24-pounder rifled cannon, with the remainder being 32-pounder smoothbores. There were also two 42-pounders, but no ammunition of that caliber was available. When the river was at normal levels, the fort's walls rose above it and were thick at the base, sloping upward to a width of nearly at the parapet. However, in February 1862, heavy rains caused the river to rise and most of the fort was underwater, including the powder magazine.
The Confederates deployed one additional defensive measure, which was then unique in the history of warfare: several torpedoes (in modern terminology, a naval minefield) were anchored below the surface in the main shipping channel, rigged to explode when touched by a passing ship. (This measure turned out to be ineffective, due to high water levels and leaks in the torpedoes' metal containers.)
Battle.
On February 4 and 5, Grant landed his divisions in two different locations. McClernand's division was north of the fort, on the east bank of the Tennessee River, to prevent the garrison's escape. C.F. Smith's division would seize Fort Heiman on the Kentucky side of the river and turn its artillery on Fort Henry. When heavy rains the night of February 5 slowed the progress of Union troops toward the forts, the battle turned on naval actions, which concluded before the infantry saw action.
Tilghman realized that it was only a matter of time before Fort Henry fell. Only nine guns remained above the water to mount a defense. While leaving artillery in the fort to hold off the Union gunboats, he ordered the majority of his force to march, under the command of Col. Adolphus Heiman, on the overland route to Fort Donelson, 12 miles (19 km) away. Fort Heiman was abandoned on February 4; gunfire from the gunboats on Fort Henry garrison caused 4 Confederate casualties [1 killed 3 wounded] on the afternoon of February 5. All but a part of Company B,1st Tennessee Artillery CSA [54 men] left Fort Henry on February 5. (Union cavalry pursued the retreating Confederates, but poor road conditions prevented any serious confrontation and they took few captives.) Tilghman, as was his custom, spent the night of February 5–6 on the steamer "Dunbar", upstream from the fort. Around midnight he sent an update on the situation to Johnston, then returned to Fort Henry just before dawn.
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