Battle of Fredericksburg The Battle of Fredericksburg December 11-15, 1862 The Battle of Fredericksburg, fought December 11-15, 1862, was one of the largest and deadliest of the Civil War. It featured the first major opposed river crossing in American military history. Union and Confederate troops fought in the streets of Fredericksburg, the Civil War’s first urban combat. And with nearly 200,000 combatants, no other Civil War battle featured a larger concentration of soldie