The 9th Corps had 53 guns at Antietam, according to Curt Johnson's and Richard C. Anderson, Jr.'s book Artillery Hell. At various points of the fight for the Burnside Bridge, anywhere from 21 to 29 of those guns fired directly on the Confederate infantry defending the bridge or the nearby Confederate artillery that supported the infantry.
At 10:30 a.m. on September 17, four Federal batteries (21 guns) concentrated their fire against the bridge's immediate Confederate defenders. The average distance that each battery fired from was approximately 1,000 yards.
|9th Corps Artillery at 10:30 a.m.|
|9th Corps Artillery at 12:15 p.m.|
|9th Corps Artillery at 1:00 p.m.|
|This view looks southeast from the Burnside Bridge past the 51st New York Monument. McMullin's, Roemer's, and Muhlenberg's batteries all fired on the bridge's defenders from this ridge (circled), about 840 yards distant.|