Orbital autocannon

The orbital autocannon (or orbital auto cannon), also known as an orbital bombardment cannon, was a starship weapon used for large-scale bombardments. The Mandator IV-class Siege Dreadnought used by the First Order was equipped with two such cannons. The cannons on the Siege Dreadnought Fulminatrix were used to destroy the Resistance base on D'Qar, with only four shots fired. According to Moden Canady, the weapons dwarfed anything available to him in the Imperial Starfleet, and had been built to scour planets of life. A single shot could obliterate planetary shields as if they were an afterthought and turn a hundred cubic meters of crust into vapor and slag.