Big Charlie was a planetary defense installation and the pride of the Planet Martine. On ICY 958 it fired at an Abh Caubh-Class Attack Ship, the ship received minimal damaged but Big Charlie was destroyed as a result of the counterattack by the ship.
The space defense system was build in anticipation of other potentially hostile human colonizers. Construction began as soon as the planet Martine was colonized.
There were fewer than ten anti-invasion lasers, and only about twenty anti-spacecraft missiles.