The largest and arguably most significant military engagement in North American history began in Gettysburg, Pennsylvania, on this date in 1863.
In a daring venture, Confederate general Robert E. Lee moved his Army of Northern Virginia into Pennsylvania in June, hoping for a decisive victory on Union soil. Trying to catch up, the Union Army of the Potomac, under new commander George Meade, moved north and west toward the Confederates, who were widely dispersed. Learning the Union Army was on the move, Lee began to consolidate his forces.
On June 30, Union cavalry led by John Buford skirmished with a small Confederate contingent just west of Gettysburg. Buford, realizing that the field provided good defensive ground, determined to hold the Confederates until the main body of the army came up.
On July 1, a larger Confederate force moved east toward Gettysburg and met resistance from Buford’s dismounted cavalry, soon joined by the First Corps. The battle ebbed and flowed during the day as troops from both sides moved to the action. Ultimately, Confederate forces arriving from the north were able to flank the Union troops and force them through the town. The Confederates failed to keep the initiative, however, and the Union was able to dig in on the ridge south and east — Cemetery Ridge.
Fifteen thousand Americans were casualties that day.