Question: What American Civil War General in the Union Army was compared to a character created by Shakespeare?

Context articles: Camp Douglas (Chicago)
Orville E. Babcock
Iago
Joseph H. Tucker
Richard Coulter (general)
Robert E. Lee: Civil War General
Skirmish at Ashley's Mills
Grand Army of the Republic
John R. McNulty
Battle of Amelia Springs

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).
Orville Elias Babcock (December 25, 1835 – June 2, 1884) was an American Civil War General in the Union Army.
 He graduated third in his class at the United States Military Academy at West Point in 1861, and served in the United States Army Corps of Engineers throughout the Civil War.
 As Assistant Engineer and aide-de-camp for district commander Nathaniel P. Banks, in 1862 Babock worked on fortifications to aid in defending the nation's capitol from Confederate attack.
 Babcock later served as aide-de-camp for Ulysses S. Grant and participated in the Overland Campaign.
 He was promoted to Brevet Brigadier General in 1865 and continued on Grant's staff during Reconstruction.
 After Grant became President in 1869, Babcock was appointed Superintendent of Public Buildings and Grounds for Washington, DC and Secretary to the President of the United States—in modern terms, the chief of staff—and he served in both posts until 1876.
 Upon his appointment Babcock was young and ambitious, and considered the Iago of the Grant administration.
 In 1869, Grant sent Babcock on a mission to explore the possibility of annexing the island nation of Santo Domingo to the United States.
Iago is a fictional character in Shakespeare's "Othello" (c. 1601–1604).
 Iago is the play's main antagonist, and Othello's standard bearer.
 He is the husband of Emilia, who is in turn the attendant of Othello's wife Desdemona.
 Iago hates Othello and devises a plan to destroy him by making him believe that his wife is having an affair with his lieutenant, Michael Cassio.
Joseph H. Tucker (1819  – October 22, 1894) was a banker, businessman and Illinois militia colonel during the first two years of the American Civil War (Civil War).
 He was given initial responsibility for building Camp Douglas at Chicago, Illinois, and was the first commander of the camp.
 Originally a training camp for Union Army recruits, in 1862 and 1863 Camp Douglas was converted into a prison camp for Confederate States Army prisoners captured by the Union Army.
 Tucker was commander of the camp from the start of its construction in October 1861 until September 28, 1862, except between February 26, 1862, and June 19, 1862.
 During this time, the camp was used as a training facility and had its initial use as a prisoner of war camp.
 Tucker was never mustered into the Union Army, remaining a colonel in the Illinois militia during the term of his service in the Civil War.
Richard Coulter, Sr. (October 1, 1827 – October 14, 1908) was an American Civil War general in the Union Army, a businessman, and banker.
 During the Civil War he was colonel of the 11th Pennsylvania Infantry, often rising to brigade command upon the wounding of superior officers.
Robert E. Lee: Civil War General is a 1996 computer wargame developed by Impressions Games and published by Sierra On-Line.
 Set during the American Civil War, it tasks the player with leading the Confederate Army of Northern Virginia to victory against the Union Army of the Potomac.
 Impressions sought to make "Civil War General" accessible to wargame newcomers by streamlining its gameplay, and the "Panzer General" series was a reference point for its design and title.
The Skirmish at Ashley's Mill, sometimes called the Skirmish at Ferry Landing was an engagement that was fought between Union Army and Confederate States Army cavalry regiments in Arkansas on September 7, 1863 during the American Civil War.
 Union Brigadier-General John W. Davidson commanding the cavalry division of the Union Army of Arkansas sent the 7th Missouri Volunteer Cavalry Regiment as his lead regiment to clear the 5th Arkansas Cavalry Regiment, under the temporary command of Major John Bull while Colonel Robert C. Newton was in temporary brigade command, from its position guarding a crossing of the Arkansas River near Little Rock, Arkansas.
 The Union cavalry forced the Confederates to retreat which opened the route to the east of the river, leading to the Battle of Bayou Fourche on September 10, 1863 and the capture of Little Rock by the Union Army of Arkansas under the command of Major General Frederick Steele.
 The Confederate regiment's casualties were 1 killed, 3 wounded and 2 captured while the Union regiment reported no casualties.
The "Grand Army of the Republic" (GAR) was a fraternal organization composed of veterans of the Union Army (United States Army), Union Navy (U.S. Navy), Marines and the U.S. Revenue Cutter Service who served in the American Civil War for the Northern/Federal forces.
 Founded in 1866 in Decatur, Illinois, and growing to include hundreds of posts (local community units) across the nation (predominately in the North, but also a few in the South and West), it was dissolved in 1956 at the death of its last member, Albert Woolson (1850–1956) of Duluth, Minnesota.
 Linking men through their experience of the war, the G.A.R. became among the first organized advocacy groups in American politics, supporting voting rights for black veterans, promoting patriotic education, helping to make Memorial Day a national holiday, lobbying the United States Congress to establish regular veterans' pensions, and supporting Republican political candidates.
 Its peak membership, at more than 490,000, was in 1890, a high point of various Civil War commemorative and monument dedication ceremonies.
 It was succeeded by the Sons of Union Veterans of the Civil War (SUVCW), composed of male descendants of Union Army and Union Navy veterans.
Lieutenant John R. McNulty of Baltimore, Maryland (1832–1912) was the Confederacy (American Civil War) war hero, who with a single strategic shot of his 2nd Maryland Artillery command’s (Baltimore Light Artillery) Confederate States of America (CSA) guns at the Battle of Old Town (U.S. Civil War 1864 Valley Campaign), while perilously close to Union Army (Federal) forces, saved Brig. Gen. (CSA) John McCausland’s element of the Army of Northern Virginia from entrapment behind Union (American Civil War) lines on return route from raids into Maryland and Pennsylvania and their sacking and burning of Chambersburg, Pennsylvania in retaliation for the Union Army burning of the Virginia Military Institute and as part of the Valley Campaigns of 1864.
The Battle of Amelia Springs, Virginia was an engagement between the Union Army (Army of the Shenandoah, Army of the Potomac and Army of the James) and Confederate Army of Northern Virginia that occurred on April 5, 1865 during the Appomattox Campaign of the American Civil War.
 It was followed by a second rear guard action near the same location on the night of April 5, 1865 and morning of April 6, 1865 during the Union Army pursuit of the Confederate forces (Army of Northern Virginia and Richmond local defense forces) which were fleeing westward after the fall of Petersburg and Richmond, Virginia at the Third Battle of Petersburg (sometimes shown as the Breakthrough at Petersburg) on April 2, 1865.
 The actions took place just prior to the Battle of Sailor's Creek (sometimes shown as "Sayler's Creek") on April 6, 1865.
 That battle would be the last major engagement between the Union Army under the overall direction of Union General-in-Chief, Lt. Gen. Ulysses S. Grant, and General Robert E. Lee's Army of Northern Virginia before that Confederate army's surrender at Appomattox Court House, Virginia on April 9, 1865.