When the British invaded neighboring Maryland, he joined a volunteer light dragoon unit and served in the defense of Baltimore.

Lee then invaded Maryland, hoping to replenish his supplies and possibly influence the Northern elections to fall in favor of ending the war.

Here, Gen. George B. McClellan successfully repelled Lee and his Southern troops from their attempt to invade Maryland and march farther north.

During the Civil War, the Confederates invaded Maryland three times.

After his victory at Bull Run, Confederate Gen. Robert E. Lee invaded Maryland in September 1862.

The Confederates then invaded Maryland, hoping to obtain European recognition and an end to the war.

At this time, September, 1862, General Robert E. Lee invaded Maryland with his Army of Northern Virginia.

Lee, however, set out to invade Western Maryland, the lead elements of his army crossing the Potomac on September 4, 1862.

By September 3, 1862, McClellan already was aware that Lee would invade Maryland across the upper Potomac River and began to shift troops into Maryland.

Lee's strategic initiative to invade Maryland was defeated.