What is "battlegroups"

Usage examples of "battlegroups".

Rear Admiral Jennifer Husac's two battlegroups of Dunkerque-class battlecruisers were TF 59's rearmost units, trailing astern of the battle-line as it fell steadily back before the advancing superdreadnoughts, leading them away from the Justin warp point.

Thirty-two superdreadnoughts, eleven assault carriers, six fleet carriers, three light carriers, five battleships, thirty battlecruisers, ten light cruisers, eleven hundred fighters, and twenty-eight support ships had been destroyed outright, and the ships which could still fight wouldn't have made three battlegroups.