Question: When was the American soldier died who served as a general in the Union Army during 1861-65 and was also a notable St. Louis citizen?

Context paragraphs:
Union Army: The Union Army or Federal Army was the land force that fought for the Union during the American Civil War, 1861 to 1865.  It included the permanent regular army of the United States, which was augmented by massive numbers of temporary units consisting of volunteers as well as conscripts.  The Union Army fought and defeated the Confederate Army during the war.  At least two and a half million men served in the Union Army; almost all were volunteers.  About 360,000 Union soldiers died from all causes; 280,000 were wounded and 200,000 deserted.

Bernard Gaines Farrar Jr: Bernard Gaines Farrar Jr. (1831–1916) served in the American Civil War as an officer in the Union Army.  Prior to his service, he was a businessman in St. Louis.  Farrar Jr. began his military career on the staff of General Nathanial Lyon and then rose through the ranks until he was brevetted Brigadier-General.  Following his time in the military he returned to St. Louis where he was involved in politics and known as a prominent leader in the St. Louis community.

Camp Douglas (Chicago): Camp Douglas, in Chicago, Illinois, sometimes described as "The North's Andersonville" was the largest Union Army prisoner-of-war camps for Confederate soldiers taken prisoner during the American Civil War.  Based south of the city on the prairie, it was also used as a training and detention camp for Union soldiers.  The Union Army first used the camp in 1861 as an organizational and training camp for volunteer regiments.  It became a prisoner-of-war camp in early 1862.  Later in 1862 the Union Army again used Camp Douglas as a training camp.  In the fall of 1862, the Union Army used the facility as a detention camp for paroled Confederate prisoners (these were Union soldiers who had been captured by the Confederacy and sent North under an agreement that they would be held temporarily while formal prisoner exchanges were worked out).

William Tecumseh Sherman: William Tecumseh Sherman (February 8, 1820 – February 14, 1891) was an American soldier, businessman, educator, and author.  He served as a general in the Union Army during the American Civil War (1861–65), for which he received recognition for his outstanding command of military strategy as well as criticism for the harshness of the "scorched earth" policies he implemented in conducting total war against the Confederate States.

William Gould (W.G.) Raymond: William Gould (W.G.) Raymond (1819–1893), a pastor, chaplain and American soldier in the Union Army during the U.S. Civil War, played a prominent role in the initial recruitment of the first federal African-American regiments of the Union Army.  In the period between the Emancipation Proclamation and the establishment of the Bureau of Colored Troops in 1863, Raymond, along with J.D. Turner, received authorization from President Abraham Lincoln to recruit and command the first federal African-American Union Army troops from the District of Columbia.  Prior to this, African-American troops were raised at the state level only, without the direct authorization of Lincoln.  The troops recruited by Raymond and Turner would become the 1st United States Colored Infantry and the first regiment of the U.S. Colored Troops (U.S.C.T), enduring threats and significant obstacles, but ultimately serving with distinction.

George B. McClellan: George Brinton McClellan (December 3, 1826October 29, 1885) was an American soldier, civil engineer, railroad executive, and politician.  A graduate of West Point, McClellan served with distinction during the Mexican–American War, and later left the Army to work in railroads until the outbreak of the American Civil War.  Early in the war, McClellan was appointed to the rank of major general and played an important role in raising a well-trained and organized army, which would become the Army of the Potomac; he served a brief period (November 1861 to March 1862) as general-in-chief of the Union Army.  Although McClellan was meticulous in his planning and preparations, these very characteristics hampered his ability to challenge aggressive opponents in a fast-moving battlefield environment.  He chronically overestimated the strength of enemy units and was reluctant to apply principles of mass, frequently leaving large portions of his army unengaged at decisive points.

Benton Barracks: Benton Barracks was a Union Army military encampment, established during the American Civil War, in St. Louis, Missouri, at the present site of the St. Louis Fairground Park.  Before the Civil War, the site was owned and used by the St. Louis Agricultural and Mechanical Association, which at the time was located on the outskirts of St. Louis.  The barracks was used primarily as a training facility for Union soldiers attached to the Western Division of the Union Army.

William W. Morris: William Walton Morris (August 31, 1801 – December 11, 1865) was an American soldier and a career officer in the United States Army.  He served as a colonel and brevet brigadier general in the Regular Army (United States), with Union Army service during the American Civil War (1861–1865).  Morris served as a brigade commander primarily in charge of the defense of Fort McHenry and Baltimore Harbor.  He had several brief periods in command of VIII Corps and of the Middle Department, which almost completely overlapped with each other.

Virginia Kyle Campbell: Virginia Kyle Campbell (January 25, 1822 – January 30, 1882) was an American socialite who played host to members of high society in St. Louis into her home.  These notable St. Louis citizens included President Ulysses S. Grant, James Eads, General William T. Sherman, and botanist Henry Shaw.  She was highly educated at a women's finishing school, taught her sons through preparatory school, traveled with her children unaccompanied by a man, and ran the household in absence of her husband.

Charles Edward Pearce: Charles Edward Pearce (May 29, 1842 – January 30, 1902) was a United States Congressman from Missouri.  He was born in Whitesboro, Oneida County, New York.  He attended Fairfield Seminary and graduated from Union College in Schenectady, New York in 1863, where he been a member of The Kappa Alpha Society.  He enlisted in the Union Army and was commissioned captain of Battery D, Sixteenth Regiment, New York Heavy Artillery in 1863.  He was promoted to the rank of major in June 1864.  On the occupation of Wilmington he was detailed as provost marshal general of the eastern district of North Carolina.  He resigned from the Army in the fall of 1865; settled in St. Louis, Missouri in 1866.  He studied law, was admitted to the bar in 1867 and commenced practice in St. Louis.  He was also interested in the manufacture of bagging, rope, and twine.  He organized and commanded the First Regiment of the Missouri National Guard in 1877.  He was delegate to the Republican National Convention in 1888 and appointed chairman of the commission to treat with the Sioux Indians of the Northwest in 1891.  He was elected as a Republican to the Fifty-fifth and Fifty-sixth Congresses (March 4, 1897 – March 3, 1901).  He declined to be a candidate for renomination in 1900.  He died in St. Louis, Missouri; interment in Fort Hill Cemetery, Auburn, New York.

Supporting paragraphs: Virginia Kyle Campbell William Tecumseh Sherman
Answer: February 14, 1891