The 166th Ohio Volunteer Infantry (or 166th OVI) was an infantry

Infantry

Infantrymen are soldiers who are specifically trained for the role of fighting on foot to engage the enemy face to face and have historically borne the brunt of the casualties of combat in wars. As the oldest branch of combat arms, they are the backbone of armies...

 regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

 in the Union Army

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 during the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

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Service

The 166th Ohio Infantry was organized at Camp Taylor near Cleveland, Ohio

Cleveland, Ohio

Cleveland is a city in the U.S. state of Ohio and is the county seat of Cuyahoga County, the most populous county in the state. The city is located in northeastern Ohio on the southern shore of Lake Erie, approximately west of the Pennsylvania border...

 and mustered in May 13, 1864 for 100 days service under the command of Colonel

Colonel (United States)

In the United States Army, Air Force, and Marine Corps, colonel is a senior field grade military officer rank just above the rank of lieutenant colonel and just below the rank of brigadier general...

 Harrison Gray Otis Blake

Harrison G. O. Blake

Harrison Gray Otis Blake was a U.S. Representative from Ohio.Born in Newfane, Vermont, Blake moved to Salem, New York, and in 1830 to Guilford, Ohio.He attended the public schools....

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The regiment left Ohio

Ohio

Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...

 for Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

, May 15 and was attached to 2nd Brigade, DeRussy's Division, XXII Corps, to July 1864. 3rd Brigade, DeRussy's Division, XXII Corps, to August 1864. Assigned to garrison duty at Fort Richardson

Fort Richardson (Arlington, Virginia)

Fort Richardson was a detached redoubt constructed by the Union Army in September 1861 as part of the defense of Washington during the American Civil War....

, Fort Barnard, Fort Reynolds

Fort Reynolds (Virginia)

Fort Reynolds was a Union Army redoubt built as part of the defenses of Washington, D.C., in the American Civil War.The fort was located in Fairlington, Arlington County, Virginia. It was constructed in September 1861 to command the approach to Alexandria by the Four Mile Run valley and was itself...

, Fort Ward

Fort Ward (Virginia)

Fort Ward is a former Union Army installation now located in the city of Alexandria in the U.S. state of Virginia. It was the fifth largest fort built to defend Washington, D.C. in the American Civil War...

, and Fort Worth

Fort Worth, Virginia

Fort Worth was a timber and earthwork fortification constructed west of Alexandria, Virginia as part of the defenses of Washington, D.C. during the American Civil War. Built in the weeks following the Union defeat at Bull Run, Fort Worth was situated on a hill north of Hunting Creek, and Cameron Run,...

 (with regimental headquarters at Fort Richardson), defenses of Washington south of the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

, until September. Participated in the repulse of Early's attack on Washington July 11-12.

The 166th Ohio Infantry mustered out of service September 9, 1864.

Ohio National Guard

Over 35,000 Ohio National Guardsmen were federalized and organized into regiments for 100 days service

Hundred Days Men

The Hundred Days Men was the nickname applied to a series of volunteer regiments raised in 1864 for 100-days service in the Union Army during the height of the American Civil War...

 in May 1864. Shipped to the Eastern Theater, they were designed to be placed in "safe" rear areas to protect railroads and supply points, thereby freeing regular troops for Lt. Gen. Ulysses S. Grant

Ulysses S. Grant

Ulysses S. Grant was the 18th President of the United States as well as military commander during the Civil War and post-war Reconstruction periods. Under Grant's command, the Union Army defeated the Confederate military and ended the Confederate States of America...

’s push on the Confederate

Confederate States of America

The Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...

 capital of Richmond, Virginia

Richmond, Virginia

Richmond is the capital of the Commonwealth of Virginia, in the United States. It is an independent city and not part of any county. Richmond is the center of the Richmond Metropolitan Statistical Area and the Greater Richmond area...

. As events transpired, many units found themselves in combat, stationed in the path of Confederate Gen. Jubal Early’s veteran Army of the Valley

Army of the Valley

The Army of the Valley was the name given to the army of Lt. Gen. Jubal Early's independent command during the Shenandoah Valley Campaigns in the summer and autumn of 1864. The Army of the Valley was the last Confederate unit to invade Northern territory, reaching the outskirts of Washington, D.C....

 during its famed Valley Campaigns of 1864

Valley Campaigns of 1864

The Valley Campaigns of 1864 were American Civil War operations and battles that took place in the Shenandoah Valley of Virginia from May to October 1864. Military historians divide this period into three separate campaigns, but it is useful to consider the three together and how they...

. Ohio Guard units met the battle-tested foe head on and helped blunt the Confederate offensive thereby saving Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

 from capture. Ohio National Guard units participated in the battles of Monacacy

Battle of Monocacy

The Battle of Monocacy was fought on July 9, 1864, just outside Frederick, Maryland, as part of the Valley Campaigns of 1864, in the American Civil War. Confederate forces under Lt. Gen. Jubal A. Early defeated Union forces under Maj. Gen. Lew Wallace...

, Fort Stevens

Battle of Fort Stevens

The Battle of Fort Stevens was an American Civil War battle fought July 11–12, 1864, in Northwest Washington, D.C., as part of the Valley Campaigns of 1864 between forces under Confederate Lt. Gen. Jubal A. Early and Union Maj. Gen. Alexander McD. McCook. Although Early caused consternation...

, Harpers Ferry

Battle of Harpers Ferry

The Battle of Harpers Ferry was fought September 12–15, 1862, as part of the Maryland Campaign of the American Civil War. As Gen. Robert E. Lee's Confederate army invaded Maryland, a portion of his army under Maj. Gen. Thomas J...

, and in the siege of Petersburg

Siege of Petersburg

The Richmond–Petersburg Campaign was a series of battles around Petersburg, Virginia, fought from June 9, 1864, to March 25, 1865, during the American Civil War...

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Notable members

• Colonel Harrison Gray Otis Blake - U.S. Representative
  United States House of Representatives
  The United States House of Representatives is one of the two Houses of the United States Congress, the bicameral legislature which also includes the Senate.The composition and powers of the House are established in Article One of the Constitution...
  
   from Ohio, 1859-1863

See also

• List of Ohio Civil War units
• Ohio in the Civil War
  Ohio in the Civil War
  During the American Civil War, the State of Ohio played a key role in providing troops, military officers, and supplies to the Union army. Due to its central location in the Northern United States and burgeoning population, Ohio was both politically and logistically important to the war effort...
  
  

External links

• Ohio in the Civil War: 166th Ohio Volunteer Infantry by Larry Stevens