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
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
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
ColonelThomas Welsh
1862-09-17
Leadership Change - Division - Brigadier General Orlando B. Willcox
Brigadier GeneralOrlando B. Willcox
1863-05-18
Leadership Change - Regiment - Lieutenant Colonel Mathew M. Dawson
Lieutenant ColonelMathew M. Dawson
1863-05-18
Leadership Change - Brigade - Colonel Daniel Leasure
ColonelDaniel Leasure
1863-05-18
Leadership Change - Division - Brigadier General Thomas Welsh
Brigadier GeneralThomas Welsh
1863-05-18
Battle - Vicksburg - Vicksburg, Mississippi
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
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
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
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
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
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
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
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
Lieutenant ColonelJoseph H. Pentecost
MajorNorman 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
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
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
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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