The explosion was a signal for all Confederate guns surrounding the fort to open fire.
VOA: special.2009.08.13
That explosion would signal the other guns surrounding the fort to open fire.
VOA: special.2009.08.06
Nottinghamshire Police Assistant Chief Constable Sean Price said the guns were necessary to send a signal to rival gangs that the police were serious about tackling drug-related crime.
The maneuver also required distributing fifty-seven tons of new maps, uprooting and reinstalling an extensive signal-wire network, and stockpiling fuel and ammunition, including shells for twelve hundred guns in the army's 108 artillery battalions.