For information on Grant's progressively higher ranks as he achieved victory after victory, see the link below on his ranks and promotions.
How many soldiers make up a Company, a Regiment, a Brigade, a Division and a Corps? How did Grant serve at each level? See the Union Army Organization link below.
The military attire of Grant during the Civil War tells you something about his rank.
1861 June Colonel 21st Illinois volunteers. Eagle on his shoulder. Buttons in groups of 2.? Not sure.
Single Star on his shoulders, August, 1861, Brigadier General of Volunteer Soldiers. Buttons in groups of 2.
Two Stars on his shoulders, February, 1862, Major General of Volunteer Soldiers. Buttons in groups of 3.
Two Stars on his shoulders, Post-Vicksburg Victory, Major General, Regular Army. Buttons in groups of 3.
Three Stars on his shoulders, March 9, 1863, Lieutenant General all Union Armies. Buttons in groups of 3.
Four Stars on his shoulders, July, 1866, General of all the Armies. Buttons in groups of 4.
Brief summary of the battle. The highly controversial first day's battle Sherman called "The devil's own day." Grant responded, "Lick 'em tomorrow though." And indeed he did.
Battle of Shiloh from the Civil War Trust
Many resources, including a great video. Click on Shiloh Animated Map. Includes narrated timeline.
Battle of Shiloh from the Essential Civil War Curriculum by Timothy B. Smith, leading tour guide at Shiloh National Military Park.
Grant at Cherry mansion, Savannah, Tennessee, a dwelling that served as his headquarters before the Battle of Shiloh.
Testimony as to Grant's sobriety on opening day of the Battle of Shiloh by Mrs. W. H. Cherry, mistress of Cherry mansion. From the magazine Confederate Veteran, its first issue, February 1893.
The South suffered a major loss in this battle with the death of Confederate General Albert Sydney Johnston. Johnston was the highest-ranking casualty of the war on either side and his death was a strong blow to the morale of the Confederacy.