In July 1866 he was made colonel of a regular infantry regiment, and in 1867 he was brevetted brigadiergeneral in the regular army for his services at Chancellorsville and major-general for his services at Spottsylvania.
At Chancellorsville his division received both on the 2nd and the 3rd of May the brunt of the attack of Lee's main army.
At the battle of Ball's Bluff (1861) he was severely wounded; he was again wounded at Fair Oaks (1862) and at Chancellorsville (1863), where he commanded a division.
Hooker's operations began well, Lee was outmanoeuvred and threatened in flank and rear, but the Federals were in the end involved in the confused and disastrous battle of Chancellorsville (q.v.).
At Chancellorsville he displayed great intrepidity and energy, and on the eve of the battle of Gettysburg was appointed to succeed Hooker.
Of the six great impacts made upon the Confederacy, four were upon Virginian soil: the first Manassas campaign (1861), the Peninsular battles (1862), second Manassas (1862), Fredericksburg, Chancellorsville (1862-63) and the great Wilderness-Petersburg series of attacks (1864-65).
In a battle such as Chancellorsville or the Wilderness guns were almost valueless, since there was little open space in which they might be used.
He was promoted major-general of volunteers on the 14th of March and was a division commander at Chancellorsville of the Eleventh Corps, under General O.
After General Hooker succeeded Burnside, Butterfield was appointed chief of staff, Army of the Potomac, and in this capacity he served in the Chancellorsville and Gettysburg campaigns.
This year saw the greatest successes and the heaviest reverses of the Union army, Gettysburg and Vicksburg and Chattanooga against Chancellorsville and Chickamauga.