Final Answer:
Union troops in the Battle of Fredericksburg were led by Major General Ambrose Burnside. The outcome was a decisive Confederate victory, with Union forces suffering significant casualties in a failed assault on well-fortified Confederate positions.
Step-by-step explanation:
Major General Ambrose Burnside commanded the Union troops during the Battle of Fredericksburg, a major engagement in the American Civil War fought on December 11–15, 1862, in Virginia. The Union forces, facing Confederate General Robert E. Lee's well-entrenched positions, launched a series of frontal assaults that resulted in heavy casualties. Despite numerical superiority, the Union suffered a resounding defeat as Confederate defenses proved formidable. The Battle of Fredericksburg stands as a notable example of the challenges faced by attacking forces against entrenched positions, and it had significant strategic implications in the context of the Civil War.