Fringe War
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The Fringe War is a fictional ongoing conflict in Larry Niven's Ringworld series. It takes place in the novels The Ringworld Throne and Ringworld's Children.
Spoiler warning: Plot and/or ending details follow.
Once the existence of the Ringworld is revealed to the Human and Kzinti governments, both factions attempt to invade the Ringworld in order to acquire its advanced technology, and possibly also to colonize its vast amounts of land. The Ringworld is defended by a loose alliance of native Protectors, each from one of the major Hominid species of the Ringworld. Their main defense is a massive laser powered by artificial solar flares, capable of vaporizing an asteroid at distances of light-hours.