A memorial marks the "high water mark" of the confederacy.
The monument's designer identified the turning point of Pickett's Charge, as "unquestionably the 'high water mark of this battle, and of the war!' " After Bachelder's monument proposal was denied by the Gettysburg Battlefield Memorial Association 2 years in a row, it was approved in the 3rd year.
Erected by April 27, 1892, the monument was recast to add 2 missing units and then dedicated with a speech by former Governor Beaver advocating the battlefield become a National Park.
The high-water mark of the Confederacy refers to a Gettysburg Battlefield area at The Angle which was the farthest American Civil War line of advance of "The Assaulting Column" of the Confederate "Longstreet's assault" into the Union Army defensive line during July 3 of the 1863 Battle of Gettysburg. Similar to a high water mark of water, the term is a reference to arguably the Confederate Army's best chance of achieving victory in the war. The line of advance was east of The Angle stone wall at various distances, e.g., the Virginians pushed the Union line back.
This designation was invented by government historian John B. Bachelder after the war when the monuments of the Gettysburg Battlefield were being erected. Some historians have argued that the battle was the turning point of the war and that this was the place that represented the Confederacy's last major offensive operation in the Eastern Theater.
Credit to Wikipedia.org