<P> In addition to being the deadliest battle of the war in terms of total casualties, Gettysburg also had the highest number of Generals killed in action of any battle in the war . The Confederacy lost generals Paul Jones Semmes, William Barksdale, Richard Garnett, and Lewis Armistead, as well as J. Johnston Pettigrew during the retreat after the battle . The Union lost Generals John Reynolds, Samuel K. Zook, Stephen H. Weed, and Elon J. Farnsworth, as well as Strong Vincent, who after being mortally wounded was given a deathbed promotion to brigadier general . Additional senior officer casualties included the wounding of Union Generals Dan Sickles (lost a leg), Francis C. Barlow, and Winfield Scott Hancock . For the Confederacy, Major General John Bell Hood lost the use of his left arm, while Major General Henry Heth received a shot to the head on the first day of battle (though incapacitated for the rest of the battle, he remarkably survived without long term injuries, credited in part due to his hat stuffed full of paper dispatches). Confederate Generals James Kemper and Isaac R. Trimble were severely wounded during Pickett's charge and captured during the Confederate retreat . General James J. Archer, in command of a brigade that most likely was responsible for killing Reynolds, was taken prisoner shortly after Reynolds' death . </P> <P> The following tables summarize casualties by corps for the Union and Confederate forces during the three - day battle . </P> <Table> <Tr> <Th> Union Corps </Th> <Th> Casualties (k / w / m) </Th> </Tr> <Tr> <Td> I Corps </Td> <Td> 6059 (666 / 3231 / 2162) </Td> </Tr> <Tr> <Td> II Corps </Td> <Td> 4369 (797 / 3194 / 378) </Td> </Tr> <Tr> <Td> III Corps </Td> <Td> 4211 (593 / 3029 / 589) </Td> </Tr> <Tr> <Td> V Corps </Td> <Td> 2187 (365 / 1611 / 211) </Td> </Tr> <Tr> <Td> VI Corps </Td> <Td> 242 (27 / 185 / 30) </Td> </Tr> <Tr> <Td> XI Corps </Td> <Td> 3807 (369 / 1924 / 1514) </Td> </Tr> <Tr> <Td> XII Corps </Td> <Td> 1082 (204 / 812 / 66) </Td> </Tr> <Tr> <Td> Cavalry Corps </Td> <Td> 852 (91 / 354 / 407) </Td> </Tr> <Tr> <Td> Artillery Reserve </Td> <Td> 242 (43 / 187 / 12) </Td> </Tr> </Table> <Tr> <Th> Union Corps </Th> <Th> Casualties (k / w / m) </Th> </Tr>

Which of the following was the greatest killer of soldiers in the civil war