How can a large fleets maintain formation in interstellar space?

Earth is under attack, the empire has gathered thousands of battleships each has a displacement of 500,000 metric tonnes and 20 motherships with a displacement of over 15 million metric tonnes now heading towards Earth as we speak. They are groups in a tight formation around a shield generator which put up a powerful force field the size of our moon orbit and can keep out asteroids and incoming missiles. I suppose traveling at subluminal speed across large distance of space, these fleets would be attracted to each other gravitationally and hence such a tight formation is disastrous. Is there any way to overcome this problem and still maintain a tight formation around the shield generator? The emperor has restricted the budget so there can only be 1 shield generator for the entire fleet, propulsion are antimatter-matter engine and ion drive (no FTL). The plan is to overwhelm Earth defences at one go, second wave commencing at later time is the finisher but no shield generator.

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How can a large fleets maintain formation in interstellar space?

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