Bombers were starships designed to strike heavily armored targets like capital ships or ground artillery. Most of these ships were armed with projectile weapons such as proton torpedoes, proton bombs, and concussion missiles. Even externally-mounted cargo containers could be used for bombing runs.
In general, bombers were slow and ungainly craft, leaving them vulnerable to enemy starfighter attack. For protection, they often relied on both fighter escorts and each other. By flying in tight formations, bombers provided overlapping fields of fire, covering each other.