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Pennsylvania 100th Volunteer Infantry (Union)

1861-08-31

Organized - Pennsylvania 100th Volunteer Infantry - Pennsylvania

1862-06-03

Battle - James Island, South Carolina

1862-09-01

Leadership Change - Division - Brigadier General Isaac Stevens

Brigadier GeneralIsaac Stevens

1862-09-01

Battle - Chantilly - Fairfax County, Virginia

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Chantilly

Confederate Maj. Gen. "Stonewall" Jackson hoped to cut off the Union retreat from Manassas the day after the Confederate victory at the second battle fought there. Jackson's wing of Lee's army made a wide, flanking march, screened by Maj. Gen. J.E.B. Stuart's cavalry, north and then east, to take the strategically important village of Germantown. There, Maj. Gen. John Pope's only two retreat routes to Washington - the Warrenton Pike and the Little River Turnpike - converged. On September 1st, beyond Chanti…READ MORE

1862-09-14

Battle - South Mountain - Frederick County, Maryland; Washington County, Maryland; Boonsboro, Maryland

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South Mountain

After his success at Second Manassas, Gen. Robert E. Lee led the Army of Northern Virginia north across the Potomac River on an invasion of Maryland in September of 1862. Lee divided his army, sending a portion of it into western Maryland while Lieut. Gen. Stonewall Jackson's wing attempted to capture the Federal garrison at Harper's Ferry. The bold plan was jeopardized on September 13th when a mislaid copy of Lee's orders revealing the Confederates' plans was given to Union commander Maj. Gen. George B. M…READ MORE

1862-09-17

Leadership Change - Regiment - Lieutenant Colonel David A. Leckey

Lieutenant ColonelDavid A. Leckey

1862-09-17

Leadership Change - Brigade - Colonel Thomas Welsh

1862-09-17

Leadership Change - Division - Brigadier General Orlando B. Willcox

Brigadier GeneralOrlando B. Willcox

1862-09-17

Battle - Antietam - Sharpsburg, Maryland

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Antietam

The Army of the Potomac, under the command of Maj. Gen. George McClellan, mounted a series of powerful assaults against General Robert E. Lee's forces along Antietam Creek near Sharpsburg, Maryland, on September 17th, 1862.READ MORE

1863-05-18

Leadership Change - Regiment - Lieutenant Colonel Mathew M. Dawson

Lieutenant ColonelMathew M. Dawson

1863-05-18

Leadership Change - Brigade - Colonel Daniel Leasure

1863-05-18

Leadership Change - Division - Brigadier General Thomas Welsh

Brigadier GeneralThomas Welsh

1863-05-18

Battle - Vicksburg - Vicksburg, Mississippi

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Vicksburg

In mid-May, 1863, after six months of unsuccessful attempts, Maj. Gen. Ulysses S. Grant's Army of the Tennessee finally converged on Vicksburg, defended by a Confederate army under Lt. Gen. John C. Pemberton. Capture of the Mississippi River town was critical to Union control of the strategic river. Vicksburg was located on a high river bluff defended with artillery, and Pemberton's men had constructed a series of fortifications in an 8-mile arc surrounding the city on the landward side. After crossing the…READ MORE

1864-05-05

Leadership Change - Regiment - Lieutenant Colonel Matthew M. Dawson

Lieutenant ColonelMatthew M. Dawson

1864-05-05

Leadership Change - Division - Brigadier General Thomas G. Stevenson

Brigadier GeneralThomas G. Stevenson

1864-05-05

Battle - Wilderness - Spotsylvania County, Virginia; Orange County, Virginia

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Wilderness

The first battle between Lt. Gen. Ulysses S. Grant and Gen. Robert E. Lee erupted late in the morning of May 5, 1864, as Maj. Gen. Gouverneur K. Warren's Union V Corps attacked Lt. Gen. Richard S. Ewell's Second Corps on the Orange Turnpike southwest of the old Chancellorsville battlefield. Although Federal infantry managed to break through at several points, the Confederate line held. Fighting shifted to the south as Lt. Gen. A.P. Hill's Third Corps engaged Maj. Gen. Winfield S. Hancock's II Corps and ele…READ MORE

1864-05-08

Leadership Change - Brigade - Colonel Daniel Leasure, and Lieutenant Colonel Gilbert P. Robinson

ColonelDaniel Leasure

Lieutenant ColonelGilbert P. Robinson

1864-05-08

Leadership Change - Division - Brigadier General Thomas G. Stevenson, Colonel Daniel Leasure, and Major General Thomas L. Crittenden

Brigadier GeneralThomas G. Stevenson

ColonelDaniel Leasure

Major GeneralThomas L. Crittenden

1864-05-08

Leadership Change - Division - Brigadier General Thomas G. Stevenson

Brigadier GeneralThomas G. Stevenson

1864-05-08

Battle - Spotsylvania Court House - Spotsylvania County, Virginia

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Spotsylvania Court House

Following the Battle of the Wilderness, Lieut. Gen. Ulysses S. Grant marched the Union army south with the hope of capturing Spotsylvania Court House and preventing Robert E. Lee's army from retreating further. Lee's Confederates, however, managed to get ahead of the Federals and block the road. Fighting began on May 8th, when the Union Fifth Corps under Maj. Gen. Gouverneur K. Warren and the Sixth Corps under Maj. Gen. John Sedgwick engaged Confederate Maj. Gen. Richard Anderson's First Corps at Laurel Hi…READ MORE

1864-05-31

Battle - Cold Harbor - Hanover County; near Mechanicsville, Virginia

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Cold Harbor

After two days of inconclusive fighting along Totopotomoy Creek northeast of Richmond, Lt. Gen. Ulysses S. Grant and Gen. Robert E. Lee turned their sights on the crossroads of Cold Harbor. Roads emanating through this critical junction led to Richmond as well as supply and reinforcement sources for the Union army. On May 31, 1864, Maj. Gen. Philip Sheridan's cavalry captured Cold Harbor. The next day, Sheridan held the crossroads against a Confederate attack. With reinforcements from both armies arriving…READ MORE

1864-06-15

Battle - Second Petersburg - Petersburg, Virginia

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Second Petersburg

As the Overland Campaign concluded, the strategic goals of Lieut. Gen. Ulysses S. Grant shifted from the defeat of Robert E. Lee's army in the field to eliminating the supply and communication routes to the Confederate capital at Richmond. The city of Petersburg, 24 miles south of Richmond, was the junction point of five railroads that supplied the entire upper James River region. Grant knew Petersburg was the key to the capture of Richmond and that Lee would be forced to defend it. Marching south from Co…READ MORE

1864-06-21

Battle - Jerusalem Plank Road - Petersburg, Virginia

1864-07-30

Battle - Crater - Petersburg, Virginia

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Crater

Two weeks after Union forces arrived to invest the Confederate defenders of Petersburg, the battle lines of both sides had settled into a stalemate. Since Cold Harbor, Lieut. Gen. Ulysses S. Grant was reluctant to mount a frontal attack against well-entrenched Confederates. By late June, Grant's lines covered most of the eastern approaches to Petersburg, but neither side seemed ready to risk an offensive move. Part of the Union line was held by Maj. Gen. Ambrose E. Burnside's Ninth Corps. Some of Burnside'…READ MORE

1864-08-18

Leadership Change - Brigade - Lieutenant Colonel Joseph H. Barnes

Lieutenant ColonelJoseph H. Barnes

1864-08-18

Leadership Change - Division - Brigadier General Julius White

Brigadier GeneralJulius White

1864-08-18

Battle - Globe Tavern - Petersburg, Virginia

1864-10-19

Battle - Cedar Creek - Frederick County, Virginia; Shenandoah County, Virginia; Warren County, Virginia

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Cedar Creek

Also known as: Cedar Creek, Belle GroveREAD MORE

1864-10-27

Battle - Boydton Plank Road - Dinwiddie County, Virginia

1865-03-25

Leadership Change - Regiment - Lieutenant Colonel Joseph H. Pentecost, and Major Norman J. Maxwell

1865-03-25

Leadership Change - Brigade - undefined Bvt BG Napoleon B. McLaughlen, and undefined Bvt Col Gilbert P. Robinson

1865-03-25

Leadership Change - Division - undefined Bvt MG Orlando B. Willcox

1865-03-25

Leadership Change - Regiment - Lieutenant Colonel Joseph H. Pentecost

Lieutenant ColonelJoseph H. Pentecost

1865-03-25

Leadership Change - Brigade - undefined Bvt BG Napoleon B. McLaughlen

1865-03-25

Battle - Fort Stedman - Petersburg, Virginia

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Fort Stedman

By March of 1865, Lieut. Gen. Ulysses S. Grant's grip on the Confederate lines around Petersburg was having its desired effect. Outnumbered and weakened by disease, desertion and shortage of food and supplies, Gen. Robert E. Lee had few options. After careful study of the Union troops in his sector of the line, Maj. Gen. John B. Gordon suggested to Lee the possibility of a successful offensive strike against Grant. In front of Gordon's men, Union-held Fort Stedman seemed the best target for a Confederate a…READ MORE

1865-04-02

Battle - Third Petersburg - Dinwiddie County, Virginia; Petersburg, Virginia

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Third Petersburg

With the Confederate defeat at Five Forks on April 1st, Lieut. Gen. Ulysses S. Grant and Maj. Gen. George Meade ordered a general assault against the Petersburg lines by the Second, Ninth, Sixth and Twenty-Fourth Corps to take place April 2nd. In the pre-dawn darkness, the Union infantry gained a successful breakthrough where Maj. Gen. Horatio G. Wright's advancing Sixth Corps met the Confederate lines held by Maj. Gen. A. P. Hill near the Boydton Plank Road. Hill was killed trying to reach his troops in t…READ MORE

1865-04-09

Battle - Appomattox Court House - Appomattox Court House, Virginia

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Appomattox Court House

Between 26,000 and 28,000 Confederate soldiers surrendered and were paroled.READ MORE

1865-07-24

Mustered Out - Pennsylvania 100th Volunteer Infantry - Pennsylvania

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