The Union government had replaced Buell on…
December 1862 CE
The Union government had replaced Buell on October 24 with Rosecrans, who has renamed his force the Army of the Cumberland.
After a period of resupplying and training his army in Nashville, Rosecrans moves against Bragg at Murfreesboro just after Christmas.
In the Battle of Stones River, Bragg surprises Rosecrans with a powerful assault on December 31, pushing the Union forces back to a small perimeter against the Stones River.