The regiment served at various times in the defense of Washington D.C., in the Department of the Shenandoah, in the Middle Department and in the Army of the Potomac.
Before the battle broke out at Gettysburg, General Meade had planned a defensive position for the Army of the Potomac at Pipe Creek, making use of its broad slopes and open fields of fire.
He was promoted to brigadier general in the United States Volunteers on April 11, 1862 and placed in command of the 3rd Brigade, 2nd Division, III Corps, Army of the Potomac.
While on official business with the New York regiments of the Army of the Potomac, he contracted a fever in the swamps near Yorktown, Virginia.
On Henry's recommendation Lowe went on to form the United States Army/"Union Army" Balloon Corps and served two years with the Army of the Potomac as a Civil War "Aeronaut".
The arts center takes its name from its location on the former site of the army's Letterman Army Hospital, which was named for Dr. Jonathan Letterman, medical director for the Army of the Potomac in the U.S. Civil War.
He designed and executed the illustrations for various works, and during the Civil War followed the Army of the Potomac, and drew every camp, up to the Battle of Gettysburg.
Judd traveled in Europe in 1862, and in 1863 he served on the United States Christian Commission in Gettysburg, then in 1864 with the United States Sanitary Commission, later with the Army of the Potomac.
Soon after the beginning of the Civil War he became captain in the 91st Pennsylvania Regiment, and served with the Army of the Potomac until after the Battle of Fair Oaks.
In 1862, he was transferred to the Army of the Potomac's Washington supply base, where he drove mules for the Union army, spending most of 1862 at Harrison's Landing and the Fort Monroe area; he "went to sea" later in the war, likely as a merchant seaman.
Popular legend has it that they were so common around the Army of the Potomac when Union general Joseph Hooker was in command that the term "hooker" was coined to describe them; however, the term had been in use since 1845.
In this campaign he was given the command of the picket line by Maj. Gen. Winfield Scott Hancock and covered the retreat of the Army of the Potomac across the Rappahannock River.
As an author he has concentrated on the military history of the American Civil War, primarily the battles and leaders of the Army of the Potomac.
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Colonel Richard Franchot resigned on September 25, 1862 and selected Colonel Emory Upton, at the time a first lieutenant in the Regular army, under whose command the regiment made a record second to none in the Army of the Potomac.
The 140th was initially placed on duty guarding the North Central Railway near Parkton, Maryland and remained there until being ordered to join the Army of the Potomac at Aquia Creek, Virginia, where they arrived on December 12.
At the beginning of May 1863, a new Union General, Joseph Hooker led the Army of the Potomac across the Rappahannock River while making a demonstration in front of Fredericksburg, Virginia.
During the morning of the battle's 2nd day (July 2), Army of the Potomac commander Maj. Gen. George G. Meade shifted units to receive an expected Confederate attack on his positions.
During the American Civil War, Hamilton entered the Union Army as a private in 1861 and served in Company A, Fifth Regiment, Pennsylvania Reserves; appointed judge advocate of the general court-martial and general pass officer for the Army of the Potomac; served on the staff of the Military Governor of Washington, D.C., until transferred to Marianna, Florida in 1865.
His unit was with the Army of the Potomac and in the Shenandoah Valley; at Cedar Creek he was in command of his regiment and was mentioned by General Philip Sheridan in his memoirs.
Gordon commanded a brigade in XII Corps, Army of the Potomac, at the Battle of Antietam, becoming acting division commander when Brig. Gen. Alpheus S. Williams became acting corps commander.
As a soldier in the Civil War, Hoyt was initially commissioned as Lieutenant Colonel, then as colonel of the 52nd Pennsylvania Infantry, leading it during the Peninsula Campaign and subsequent actions of the Army of the Potomac until January 1863, the regiment was ordered to Charleston, South Carolina.
The 22nd Massachusetts became part of the Army of the Potomac and left their winter quarters on March 10, 1862 to participate in Maj. Gen. George B. McClellan's Peninsular Campaign.
In September 1862, Farnsworth led a cavalry brigade in the Army of the Potomac during the Maryland Campaign, sparring with Confederate cavalry under J.E.B. Stuart and Wade Hampton in a series of minor engagements near South Mountain and Middletown, Maryland.
He was preparing to enter Phillips Academy when Carter enlisted as a private in the 22nd Massachusetts Infantry at the start of the American Civil War and remained with the Army of the Potomac from August 5, 1862 until October 4, 1864.
He received a commission as a brigadier general on July 19, 1861, and served first as a brigade commander in the (Confederate) Army of the Potomac, and then in David R. Jones' division of the Army of Northern Virginia through the Peninsula Campaign, Seven Days Battles, Northern Virginia Campaign, and Maryland Campaign.
Sharpsburg gained national recognition during the American Civil War, when Confederate General Robert E. Lee invaded Maryland with his Army of Northern Virginia in the summer of 1862 and was intercepted near the city by Union General George B. McClellan with the Army of the Potomac.
After a prologue with Robert E. Lee smashing the Army of the Potomac at the Battle of Camp Hill, Pennsylvania, in October 1862, and the subsequent Anglo-French diplomatic recognition of the Confederate States of America, the novel begins on June 28, 1914, the same day Archduke Franz Ferdinand was assassinated in Sarajevo.
In the Civil War, he served as assistant engineer in the Army of the Potomac during the Peninsular campaign and in the northern Virginia campaign, and from July, 1864, to September, 1865, commanded as colonel, a regiment of veteran volunteer engineers.