>>211746995there were only seven beacons in the book with 20-30 miles between them, don't remember if the movie increased this number
>just in case Gondor asks Rohan for aid every few centuriesthe beacons were made to work the opposite way, as an early warning system for minas tirith in the event of an attack from an enemy, using them to ask rohan for aid was gandalf's idea
>Why didn't they just use pigeons?the beacons were much much faster than carrier pigeons would have been and much much more reliable