end of the Big Sandy expedition. Nashville/Pittsburg Landing/Shiloh At the end of November 1861, Nelson joined the Army of the Ohio under the command of Don Carlos Buell at Louisville. Nelson commanded the Fourth Division and that unit became the first to enter Nashville on February 25, 1862. After Union troops recaptured Nashville, the capitol building was held by the 6th Ohio Infantry. It was there that Brigadier General Nelson was approached by William Driver, a sea captain who had retired to Nashville and remained loyal to the Union. Driver had in his possession the U.S. flag nicknamed "Old Glory" which he had hidden from rebel marauders. He requested that this famous flag be flown over the capitol building to signify the state was now held by the Union. Nelson granted the request and the flag, after flying over the capitol for a day, was returned to its loyal owner. The next month, Buell received orders to join Brigadier General Ulysses S. Grant at Savannah, Tennessee, and Nelson obtained the lead for that advance when Buell gave him permission to wade his men across the Duck River at Columbia, Tennessee. Nelson arrived at Savannah on Saturday, April 5, 1862, and at dawn the following morning, the enemy assaulted Federal troops below Shiloh Church. That morning, Grant ordered Nelson and Wallace to advance to Pittsburg Landing. By 4:30 p.m., the Confederates had driven the Union army back toward Pittsburg Landing within a mile of the Tennessee River. Fresh troops under Nelson reached the Union line around 5:30 PM, and reinforced Grant's left flank and helped repulse the final two Confederate charges of the day. On Monday morning, Nelson's Fourth Division along with Hurlbut's division led the Union counterattack on Grant's left flank. Late in the afternoon on April 7, 1862, the Confederates withdrew, and the bloodiest fighting that had ever occurred in the Western Hemisphere was over. Ebenezer Hannaford served in the 6th Ohio Infantry under Nelson and wrote that "no commander during the war enjoyed the confidence of his troops in a greater degree than did Nelson at the head of the Fourth Division Army of the Ohio, which might almost be said to have been his own creation." Those men had no love for the harsh ways of "Big Buster," but they genuinely valued his willingness to chastise officers openly who shirked their responsibilities. Siege of Corinth Nelson's division