ANSWER
No, he was an Union General.
Union - Ambrose Burnside Confederate - Robert E. Lee
A.E. Burnside [NEW RESPONDENT] Braxton Bragg
Confederate General Robert E. Lee defeated the forces of Union General Burnside at the Battle of Fredericksburg. The defeat was due to the bad tactics of Burnside, who under the command of Lincoln, urged Burnside to begin a frontal assault. It was a disaster for the Union.
General Ambrose Burnside went to attack the Confederate Capitol in Richmound, Virginia. His attempt ended with and overwhelming defeat which was the significance. This failure lead to Burnside's replacement with General Joseph Hooker.
Major General Ambrose Burnside
Ambrose Burnside was a Union general during the American Civil War. He is best known for his leadership at the Battle of Antietam and for his distinctive facial hair, which led to the term "sideburns." Burnside also served as the governor of Rhode Island and held various military commands throughout the war.
Ambrose Burnside led the raids that distracted Confederate troops, enabling General Grant to land his troops south of Vicksburg.
burnside
At the Battle of Fredricksburg, Confederate General Robert E. Lee' opponent was General Ambrose Burnside. Lee gained a major victory at that battle.
Major General Ambrose Burnside took his army from Kentucky and occupied the important city of Knoxville, Tennessee on September 2, 1863. President Lincoln knew there was pro-Union sentiment in eastern Tennessee and it was important to have Union troops there. Burnside also took the opportunity to cut Confederate railway lines.
Lincoln was disappointed that General George B. McClellan had allowed Confederate general Lee to escape after the Battle of Antietam. The result of Lincoln's disappointment was the replacement of McClellan by General Burnside.
General Ambrose Burnside was the commander of Union's IX Corps. About noon he attacked the Confederate right flank and managed to drive back Longstreet's Confederate units to the southern end of Sharpsburg. The battle was decisively going in favor of Union Army. But Confederate division under General Ambrose P. Hill, coming from Harper's Ferry stroke the Federals in the flank driving back them to Antietam Creek, saving Lee's army and ended the battle.