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Celebrating 100 Years of Science! | 1925-2025

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Symbol Package
Illustration of Chesapeake Bay watershed
USA: Chesapeake Bay watershed
Monument to the 1st New York Light Artillery, Battery (L) (E Attached). Commander: Capt. Gilbert H. Reynolds. Location: South Reynolds Avenue, McPherson Ridge
1st New York Light Artillery, Battery (L) (E…
Devil's Den near Little Round Top, Gettysburg. This outcropping of massive igneous boulders was the site of fierce fighting on July 2, 1863, with a Confederate assault by Lt Gen James Longstreet's First Corps through this area. Conducted by the division of Maj. Gen. John Bell Hood, and including both the Texas Brigade and 3rd Arkansas, the charge was directed towards the left flank of the Union Army of the Potomac and hit Devil's Den as well as the high ground at Little Round Top. Devil's Den was defended by the Union III Corps division of Maj. Gen. David B. Birney, later reinforced by the V Corps.
Devil's Den
Battlefield fence on McPherson Ridge, Gettysburg National Military Park
Gettysburg fence
Battlefield fence on McPherson Ridge, Gettysburg National Military Park
Gettysburg fence
From NPS brochure: The Battle of Gettysburg began about 8 am to the west beyond McPherson barn as Union cavalry confronted Confederate infrantry advancing east along Chambersburg Pike. Heavy fighting spread north and south along this ridgeline as additional forces from both sides arrived.
McPherson Barn, looking northwest
Monument to Major General John F. Reynolds, who was killed in the Battle of Gettysburg on the first day - July 1, 1863.
Monument to Major General John F. Reynolds
Pennsylvania Memorial, the largest in the Gettysburg National Military Park, features bronze tablets of all Pennsylvania infantry, cavalry, and artillery units who fought in the Battle of Gettysburg, 1-3 July, 1863. It was dedicated in 1910.
Pennsylvania Memorial
Pennsylvania Memorial, the largest in the Gettysburg National Military Park, features bronze tablets of all Pennsylvania infantry, cavalry, and artillery units who fought in the Battle of Gettysburg, 1-3 July, 1863. It was dedicated in 1910.
Pennsylvania Memorial
Monument to the 1st Corps, 3rd Division. Location: South Reynolds Avenue, McPherson Ridge
ARMY OF THE POTOMAC
FIRST CORPS THIRD DIVISION
FIRST BRIGADE
Col. Chapman Biddle
Brig. Gen. Thomas A. Rowley
80th New York 121st 142D 151st Penna. Infantry

July 1. Arrived and went into position about 11. 30 A. M. left of Reynolds's Woods. The 151st Penna. having been sent to reinforce Second Brigade on right of Reynolds's Woods. The remaining regiments with Battery B 1st Penna. formed line facing west and held this position until near 4 P. M. when being pressed with superior numbers in front and outflanked on the left the Brigade retired to Seminary Ridge. On the withdrawal of the Corps the Brigade retired to Cemetery Hill and formed on the left along Taneytown Road and remained there until noon the next day.
July 2. Between 5 and 6 P. M. the Brigade was moved to the left centre from which First Division Second Corps had been taken to support Third Corps.
July 3. Remained in the same position and assisted in repelling Longstreet's assault in the afternoon taking many prisoners. At 6 P. M. withdrew to former position on Taneytown Road.
Casualties Killed 8 Officers 103 Men Wounded 41 Officers 516 Men Captured or Missing 8 Officers 222 Men Total 898
Union Brigade Marker
Monument to the 1st Corps, 3rd Division. Location: South Reynolds Avenue, McPherson Ridge
ARMY OF THE POTOMAC
FIRST CORPS THIRD DIVISION
FIRST BRIGADE
Col. Chapman Biddle
Brig. Gen. Thomas A. Rowley
80th New York 121st 142D 151st Penna. Infantry

July 1. Arrived and went into position about 11. 30 A. M. left of Reynolds's Woods. The 151st Penna. having been sent to reinforce Second Brigade on right of Reynolds's Woods. The remaining regiments with Battery B 1st Penna. formed line facing west and held this position until near 4 P. M. when being pressed with superior numbers in front and outflanked on the left the Brigade retired to Seminary Ridge. On the withdrawal of the Corps the Brigade retired to Cemetery Hill and formed on the left along Taneytown Road and remained there until noon the next day.
July 2. Between 5 and 6 P. M. the Brigade was moved to the left centre from which First Division Second Corps had been taken to support Third Corps.
July 3. Remained in the same position and assisted in repelling Longstreet's assault in the afternoon taking many prisoners. At 6 P. M. withdrew to former position on Taneytown Road.
Casualties Killed 8 Officers 103 Men Wounded 41 Officers 516 Men Captured or Missing 8 Officers 222 Men Total 898
Union Brigade Marker
Monument to the 2nd US Horse Artillery, Battery (A). Location: Chambersburg Pike and Stone Avenue. ARMY OF THE POTOMAC CAVALRY CORPS SECOND BRIGADE HORSE ARTILLERY BATTERY A SECOND U. S. ARTILLERY SIX 3 INCH RIFLES Lieut. John H. Calef Commanding June 30. Arrived in the evening from Emmitsburg and took position on the Chambersburg Pike. July 1. Advanced with the Cavalry went into position with right section on right of the road left section on the left and centre with Col. Wm. Chamble's Brigade on the right of Fairfield Road. The first Union gun of the battle was fired from right section and the positions held under a severe fire until the First Corps arrived about 10 A. M. The Battery was then relieved by Capt. J. A. Hall's 2D Maine Battery and after being supplied with ammunition returned about 3 P M. but under a front and enfilading fire it retired to a line in front of Cemetery Ridge and towards night moved to the left about a mile and bivouacked for the night near theThird Corps. July 2. A. M. marched with the First Brigade of Major General John Buford's Division to Taneytown en route to Westminster. Casualties Wounded 12 Men Lost 13 Horses Killed
Union U.S. Regulars Marker
Monument to the 2nd US Horse Artillery, Battery (A). Location: Chambersburg Pike and Stone Avenue. ARMY OF THE POTOMAC CAVALRY CORPS SECOND BRIGADE HORSE ARTILLERY BATTERY A SECOND U. S. ARTILLERY SIX 3 INCH RIFLES Lieut. John H. Calef Commanding June 30. Arrived in the evening from Emmitsburg and took position on the Chambersburg Pike. July 1. Advanced with the Cavalry went into position with right section on right of the road left section on the left and centre with Col. Wm. Chamble's Brigade on the right of Fairfield Road. The first Union gun of the battle was fired from right section and the positions held under a severe fire until the First Corps arrived about 10 A. M. The Battery was then relieved by Capt. J. A. Hall's 2D Maine Battery and after being supplied with ammunition returned about 3 P M. but under a front and enfilading fire it retired to a line in front of Cemetery Ridge and towards night moved to the left about a mile and bivouacked for the night near theThird Corps. July 2. A. M. marched with the First Brigade of Major General John Buford's Division to Taneytown en route to Westminster. Casualties Wounded 12 Men Lost 13 Horses Killed
Union U.S. Regulars Marker 2
Virginia Memorial at Seminary Ridge, Gettysburg. The plaque at the base reads
Virginia Memorial
Virginia Memorial at Seminary Ridge, Gettysburg. The plaque at the base reads
Virginia Memorial
Illustration locator map of Chesapeake Bay watershed
USA MD VA: Chesapeake Bay watershed locator map

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