Birthdays
Thomas Stanhope Bocock
Turns 48 on this date
Alexander Hamilton Coffroth
Turns 35 on this date
Hugh Asbury Curran
Turns 23 on this date
Alfred Napoléon Alexander Duffié
Turns 30 on this date
Ethan Allen Hitchcock
Turns 65 on this date
Robert Hammond Watson
Turns 45 on this date
Events
| Campaigns/Elections | In Dixon, Illinois, four thousand Union supporters dedicate a new Unionist meeting hall | 05/18/1863 |
| Battles/Soldiers | On the Mississippi, the Union's Army of the Tennessee completely surrounds Vicksburg | 05/18/1863 |
| Crime/Disasters | U.S. Navy sailing vessel strikes a reef off Haiti and is lost though all the crew survive | 05/18/1863 |