<Table> <Tr> <Th> Key commanders (Army of the Potomac) </Th> </Tr> <Tr> <Td> <Ul> <Li> Maj. Gen . George Meade, (Commanding) USA </Li> <Li> Maj. Gen . John F. Reynolds, USA </Li> <Li> Maj. Gen . Winfield Scott Hancock, USA </Li> <Li> Maj. Gen . Daniel Sickles, USA </Li> <Li> Maj. Gen . George Sykes, USA </Li> <Li> Maj. Gen . John Sedgwick, USA </Li> <Li> Maj. Gen . Oliver Otis Howard, USA </Li> <Li> Maj. Gen . Henry Warner Slocum, USA </Li> <Li> Maj. Gen . Alfred Pleasonton, USA </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Key commanders (Army of the Potomac) </Th> </Tr> <Tr> <Td> <Ul> <Li> Maj. Gen . George Meade, (Commanding) USA </Li> <Li> Maj. Gen . John F. Reynolds, USA </Li> <Li> Maj. Gen . Winfield Scott Hancock, USA </Li> <Li> Maj. Gen . Daniel Sickles, USA </Li> <Li> Maj. Gen . George Sykes, USA </Li> <Li> Maj. Gen . John Sedgwick, USA </Li> <Li> Maj. Gen . Oliver Otis Howard, USA </Li> <Li> Maj. Gen . Henry Warner Slocum, USA </Li> <Li> Maj. Gen . Alfred Pleasonton, USA </Li> </Ul> </Td> </Tr> <Ul> <Li> Maj. Gen . George Meade, (Commanding) USA </Li> <Li> Maj. Gen . John F. Reynolds, USA </Li> <Li> Maj. Gen . Winfield Scott Hancock, USA </Li> <Li> Maj. Gen . Daniel Sickles, USA </Li> <Li> Maj. Gen . George Sykes, USA </Li> <Li> Maj. Gen . John Sedgwick, USA </Li> <Li> Maj. Gen . Oliver Otis Howard, USA </Li> <Li> Maj. Gen . Henry Warner Slocum, USA </Li> <Li> Maj. Gen . Alfred Pleasonton, USA </Li> </Ul>

What happened on july 4 1863 that affected vicksburg for the next 82 years