regroup, re-group v. i. & v. t. To reorganize into new groups; to reform a group that has been dispersed. The spelling without the hyphen is more common.
... roared the Solar Guard captain. "Attention! Attention! All ships—all ships!" he called into the fleet intercom. "This is Strong aboard command ship. Bandit formation closing fast. Regroup! Take ... — The Revolt on Venus • Carey Rockwell
...
