Which BP provides the best sectors of fire along an alternate AoA?

• A. Primary BP
• B. Alternate BP
• C. Supplementary BP
• D. Subsequent BP

Answer: (C)

The key idea is ensuring continuous, overlapping fields of fire when facing a potential alternate Axis of Advance. A Supplementary Battle Position is added specifically to extend and fill the gaps in coverage along that alternate axis. It provides an additional, flexible angle of fire that can be oriented to cover the secondary approach and mutual support the other positions, without pulling resources away from the primary and alternate positions.

The primary Battle Position is set for the main axis of advance, so its sectors of fire best defend that direction but may leave vulnerabilities if the enemy switches to the alternate axis. The Alternate Battle Position is oriented to help with that secondary axis, yet it isn’t meant to provide the full, overlapping coverage across all directions or to fill every potential gap on its own. A Supplementary Battle Position serves as the additional layer of fires needed to ensure there are no gaps along the alternate AoA and to keep fires mutually supporting across positions, while still allowing the other BPs to cover their respective axes.