The Angle 22. Map 3 Federal Artillery Fields of Fire E ach batterys field of fire is represented by three lines on the map, one each for the left, right and center of their probable fields of fire. The length of the lines on the map correspond to the distances that the individual batteries could reach. Since a battery normally had four or six guns, the map should have 12 or 18 lines per battery, but it would make the map virtually unreadable. The effective range of each type of weapon is calculated at ground level with a five degree elevation and a maximum powder load.
Effective range is gained as the elevation is increased.
Since the Federal batteries were generally higher than their targets, their range was slightly longer than shown here, so these ranges are slightly conservative. We have omitted Lt. Sylvanus T. Ruggs and Lt. David H. Kinzies batteries because we are unsure of the time they joined the fray. O ver the years the Gettysburg battlefield has been mapped many times.