Today marks the 155 th anniversary of the Union defeat at the Battle of Fredericksburg. The Battle of Fredericksburg, fought December 13, 1862, was a major Confederate victory and one of the most lopsided defeats of the Civil War for Union forces. The battle had over 18,000 casualties. Battle of Fredericksburg Date December 11–15, 1862 Location Spotsylvania County and Fredericksburg, Virginia Victor Confederate victory Contenders United States (Union) Confederate States Military Leaders Ambrose E. Burnside Robert E. Lee Military Units in Battle Army of the Potomac Army of Northern Virginia Unit Strength About 114,000 About 72,500 Casualties and Deaths Total: … On the Union side, they suffered 12,647 casualties while the Confederate only had over five thousand casualties. The perceived casualties as reported in both Union and Confederate accounts ran to 20,000 on the Union side, making the defeat and its costs seem even worse. The battle resulted in significant casualties for the Union Army. It is remembered as one of the most one-sided battles of the American Civil War. Battle of Fredericksburg, clash between Union and Confederate forces on December 11–15, 1862, during the American Civil War. One of the most one-sided battles of the Civil War, the Battle of Fredericksburg cost the Army of the Potomac 1,284 killed, 9,600 wounded, and 1,769 captured/missing. Battle of Fredericksburg casualties occurred during the Maryland Campaign of American Civil War. Almost immediately, Confederate troops opened fire. The entire Battle of Fredericksburg resulted in 12,653 Union casualties and 4,201 Confederate casualties. This database includes lists and narrative reports reporting casualties sustained by Confederate Army units during the war. The Battle of Fredericksburg was a major defeat for the Union Army. On the Union side, they suffered 12,647 casualties while the … In hopes of quickly advancing to the Confederate capitol at Richmond, Virginia, Burnside leads the Army of the Potomac across the Rappahannock River near Fredericksburg, Virginia. Many Union Army mistakes led to the overwhelming Confederate victory at this battle. The Union troops, despite outnumbering the Confederates, suffered a crushing defeat. The Battle of Fredericksburg was fought December 11–15, 1862, in and around Fredericksburg, Virginia, in the Eastern Theater of the American Civil War.The combat, between the Union Army of the Potomac commanded by Major General Ambrose Burnside and the Confederate Army of Northern Virginia under General Robert E. Lee, was part of the Union Army's futile frontal attacks on December … Although the Union vastly outnumbered the Confederates (120,000 Union men to 85,000 Confederate men) they suffered over twice as many casualties (12,653 to 5,377). The Union Army suffered terrible casualties in … The Battle of Fredericksburg, fought in and around Fredericksburg, Virginia, from December 11 to December 15, 1862, between General Robert E. Lee's Confederate Army of Northern Virginia and the Union Army of the Potomac, commanded by Maj. Gen. Ambrose E. Burnside, is remembered as one of the most one-sided battles of the American Civil War.