Short answers, pulled from the story.
The Battle of Fort Donelson began on the 12th of February 1862, in the Western Theater of the American Civil War. Union forces had just captured Fort Henry on February 6, opening the Tennessee River for their troop and supply movements.
Confederate forces under Brigadier General John B. Floyd consisted of approximately 16,171 men. Albert Sidney Johnston divided his two main forces after Fort Henry fell, with Major General Leonidas Polk commanding 12,000 men at Columbus, Kentucky, while William J. Hardee led 14,000 men at Bowling Green, Kentucky.
Union losses totaled 2,691 men including 507 killed, 1,976 wounded, and 208 captured or missing. Confederate casualties reached 13,846 with 327 killed, 1,127 wounded, and 12,392 captured or missing.
Grant was promoted to major general of volunteers second in seniority only to Henry W. Halleck in West. After newspapers reported Grant won battle with cigar clamped in teeth he was inundated with cigars sent from admirers.
Disgusted at show of cowardice Nathan Bedford Forrest announced he did not come here to surrender his command. He stormed out meeting leading about seven hundred cavalrymen on escape from fort.