<Tr> <Td_colspan="2"> <Ul> <Li> Fredericksburg </Li> <Li> Mud March </Li> </Ul> </Td> </Tr> <Ul> <Li> Fredericksburg </Li> <Li> Mud March </Li> </Ul> <P> The Battle of Fredericksburg was fought December 11--15, 1862, in and around Fredericksburg, Virginia, between General Robert E. Lee's Confederate Army of Northern Virginia and the Union Army of the Potomac, commanded by Major General Ambrose Burnside, as part of the American Civil War . The Union Army's futile frontal attacks on December 13 against entrenched Confederate defenders on the heights behind the city are remembered as one of the most one - sided battles of the war, with Union casualties more than three times as heavy as those suffered by the Confederates . A visitor to the battlefield described the battle to U.S. President Abraham Lincoln as a "butchery ." </P> <P> Burnside's plan was to cross the Rappahannock River at Fredericksburg in mid-November and race to the Confederate capital of Richmond before Lee's army could stop him . Bureaucratic delays prevented Burnside from receiving the necessary pontoon bridges in time and Lee moved his army to block the crossings . When the Union army was finally able to build its bridges and cross under fire, urban combat in the city resulted on December 11--12 . Union troops prepared to assault Confederate defensive positions south of the city and on a strongly fortified ridge just west of the city known as Marye's Heights . </P>

Who was involved in the battle of fredericksburg