Fredericksburg was one of the Civil War's bloodiest and deadliest engagements

Fredericksburg was one of the Civil War's bloodiest and deadliest engagements, with approximately 200,000 fighters, the most of any Civil War engagement. It featured the first opposing river crossing in American military history, as well as the first instance of urban fighting during the Civil War. Victory for the Confederacy. The Union Army of the Potomac lost more than 12,500 men. Lee's Confederate force suffered around 6,000 casualties.

In detail, the Union army suffered 12,653 casualties (1,284 dead, 9,600 wounded, and 1,769 captured/missing). Two Union generals were mortally wounded: Brig. Gens. Conrad F. Jackson and George D. Bayard. The Confederate army suffered 5,377 casualties (608 dead, 4,116 wounded, and 653 captured/missing), the majority of whom died in the early battle on Jackson's front. Brig. Gens. of the Confederacy T. and Maxcy Gregg Both R. R. Cobb and R. R. Cobb were killed. Each army's casualties demonstrated how devastating the Union army's tactics were. Although casualties on the southern flank were fairly equal (about 4,000 Confederate, 5,000 Union), the action on the northern flank was completely lopsided, with almost eight Union casualties for every Confederate. Burnside's forces had lost far more casualties in the diversionary attack than in his main endeavor.