Harvesters

The aliens in the movie Independence Day are a nameless race of intelligent beings. They have no home planet and instead move throughout the universe stealing the resources of other planets and wiping out their inhabitants to prevent them from standing in the way. The aliens' mothership is 1/4 the size of Earth's moon and can deploy about a dozen 15-mile wide drones that can destroy entire cities with a single laser blast. Both the mothership and the drones can deploy small fighter ships with the size and maneuverability of an earthling fighter jet.

Since all of the aliens' ships are protected by force fields, the surviving protagonists use a stolen alien fighter and a computer virus to drop the force fields, providing time for the ships to be destroyed. The massive laser cannons on the city destroyer drones are their weak spot, and one hit causes a chain reaction that takes down the whole craft. The mothership is destroyed by one well-placed nuclear missile onboard the stolen alien fighter.