The Department of the Monogahela was a military department created by the

United States War Department The United States Department of War, also called the War Department (and occasionally War Office in the early years), was the United States Cabinet department originally responsible for the operation and maintenance of the United States Army, a ...

during the Gettysburg Campaign of the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states th ...

History

On June 9, 1863,

President President most commonly refers to: *President (corporate title) *President (education), a leader of a college or university *President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ful ...

Abraham Lincoln Abraham Lincoln ( ; February 12, 1809 – April 15, 1865) was an American lawyer, politician, and statesman who served as the 16th president of the United States from 1861 until his assassination in 1865. Lincoln led the nation thro ...

, responding to

Robert E. Lee Robert Edward Lee (January 19, 1807 – October 12, 1870) was a Confederate general during the American Civil War, towards the end of which he was appointed the overall commander of the Confederate States Army. He led the Army of Nort ...

's impending invasion of

Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...

and

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

, called for 100,000 volunteers from those two states, as well as

West Virginia West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers classify West Virginia as part of the Southern United States while the Bur ...

and

Ohio Ohio () is a state in the Midwestern region of the United States. Of the fifty U.S. states, it is the 34th-largest by area, and with a population of nearly 11.8 million, is the seventh-most populous and tenth-most densely populated. The sta ...

, to help repel the invasion, with only about 33,000 recruits answering his call. The

Secretary of War The secretary of war was a member of the U.S. president's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War", had been appointed to serve the Congress of the ...

Edwin M. Stanton Edwin McMasters Stanton (December 19, 1814December 24, 1869) was an American lawyer and politician who served as U.S. Secretary of War under the Lincoln Administration during most of the American Civil War. Stanton's management helped organize ...

, ordered the creation of two departments to organize these

militia A militia () is generally an army or some other fighting organization of non-professional soldiers, citizens of a country, or subjects of a state, who may perform military service during a time of need, as opposed to a professional force of r ...

and defend Pennsylvania. The

Department of the Susquehanna The Department of the Susquehanna was a military department created by the United States War Department during the Gettysburg Campaign of the American Civil War. Its goal was to protect the state capital and the southern portions of the commonwealt ...

consisted of most of central and eastern Pennsylvania. The Department of the Monongahela consisted of western Pennsylvania, including Johnstown, the

Laurel Highlands The Laurel Highlands is a region in southwestern Pennsylvania made up of Fayette County, Somerset County and Westmoreland County. It has a population of about 600,000 people. The region is approximately fifty-five miles southeast of Pitts ...

, and

Erie Erie (; ) is a city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States. Erie is the fifth largest city in Pennsylvania and the largest city in Northwestern Pennsylvania with a population of 94,831 a ...

, as well as

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Brooke Brooke may refer to: People * Brooke (given name) * Brooke (surname) * Brooke baronets, families of baronets with the surname Brooke Places * Brooke, Norfolk, England * Brooke, Rutland, England * Brooke, Virginia, US * Brooke's Point, Palawan ...

, and

counties in

, and the Ohio counties of Columbiana,

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, and Belmont. The headquarters were established in

Pittsburgh Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...

, under the command of

Maj. Gen. Major general (abbreviated MG, maj. gen. and similar) is a military rank used in many countries. It is derived from the older rank of sergeant major general. The disappearance of the "sergeant" in the title explains the apparent confusion of a ...

William T. H. Brooks, a combat veteran of the

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Army of the Potomac The Army of the Potomac was the principal Union Army in the Eastern Theater of the American Civil War. It was created in July 1861 shortly after the First Battle of Bull Run and was disbanded in June 1865 following the surrender of the Confedera ...

. Brooks energetically set out to defend Pittsburgh, ordering citizens and railroad crews to build an elaborate network of earthworks and fortifications along key routes of approach that any invader might use. He organized home guard units, and sent out scouts looking for signs of

Confederate Confederacy or confederate may refer to: States or communities * Confederate state or confederation, a union of sovereign groups or communities * Confederate States of America, a confederation of secessionist American states that existed between 1 ...

activity. He established communications linkages with Maj. Gen.

Ambrose Burnside Ambrose Everett Burnside (May 23, 1824 – September 13, 1881) was an American army officer and politician who became a senior Union general in the Civil War and three times Governor of Rhode Island, as well as being a successful inventor ...

, commanding the adjacent Department of the Ohio, as well as the Department of the Susquehanna's Maj. Gen. Darius N. Couch. Pennsylvania Governor

Andrew Curtin Andrew Gregg Curtin (April 22, 1815/1817October 7, 1894) was a U.S. lawyer and politician. He served as the Governor of Pennsylvania during the Civil War, helped defend his state during the Gettysburg Campaign, and led organization of the crea ...

sent 10,000 rifles, ammunition, and supplies to Pittsburgh, and Federal troops were hastily diverted to assist in the defense of the river town should it be threatened. Brooks's fears over a Confederate attack on Pittsburgh would prove unfounded, although

Morgan's Raid Morgan's Raid was a diversionary incursion by Confederate cavalry into the Union states of Indiana, Kentucky, Ohio and West Virginia during the American Civil War. The raid took place from June 11 to July 26, 1863, and is named for the commander ...

through southern Ohio caused concern, as did

John D. Imboden John Daniel Imboden (; February 16, 1823August 15, 1895), American lawyer, Virginia state legislator, and a Confederate army general. During the American Civil War, he commanded an irregular cavalry force. After the war, he resumed practicing la ...

's raid on the

Baltimore & Ohio Railroad The Baltimore and Ohio Railroad was the first common carrier railroad and the oldest railroad in the United States, with its first section opening in 1830. Merchants from Baltimore, which had benefited to some extent from the construction of ...

between Martinsburg, WV, and Cumberland, MD, well southeast of Pittsburgh. Satisfied that Pittsburgh was indeed safe with the repulse of

at the

Battle of Gettysburg The Battle of Gettysburg () was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War. In the battle, Union Major General George Meade's Army of the Po ...

and the capture of

John Hunt Morgan John Hunt Morgan (June 1, 1825 – September 4, 1864) was an American soldier who served as a Confederate general in the American Civil War of 1861–1865. In April 1862, Morgan raised the 2nd Kentucky Cavalry Regiment (CSA) and fought in t ...

following the

Battle of Salineville The Battle of Salineville occurred July 26, 1863, near Salineville, Ohio, during Morgan's Raid in the American Civil War. It was the northernmost military action involving an official command of the Confederate States Army. The Union victory sha ...

, Brooks sent home the volunteers and militia, and the forts were abandoned. The department was merged into the Department of the Susquehanna on April 6, 1864.The war of the rebellion: a compilation of the official records of the Union and Confederate armies. ; Series 1 - Volume 33, p. 814 General Brooks returned to active field command, leading a division in the XVIII Corps in the

Army of the James The Army of the James was a Union Army that was composed of units from the Department of Virginia and North Carolina and served along the James River (Virginia), James River during the final operations of the American Civil War in Virginia. Histor ...

References

Sources

* Bates, Samuel P., ''Martial Deeds of Pennsylvania.'' Philadelphia: T. H. Davis & Co., 1876. * Boatner III, Lt. Col. Mark Mayo, ''The Civil War Dictionary''. New York: Van Rees Press, 1959.

External links

Bivouac Books article on fortifying Pittsburgh in 1863
{{Pennsylvania in the Civil War Monongohela, Department of the History of Pittsburgh Pennsylvania in the American Civil War West Virginia in the American Civil War 1863 establishments in the United States