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In Star Wars, hyperspace is the main way of travel. It's used by the Rebel Alliance both as a way to attack and to escape.

Quite understandably, the Empire created Interdictor-class Star Destroyers. Those starships where made with the sole purpose of preventing other starships to go into hyperspace.

But even though those ships exist, they barely saw any use at all, especially in battles where their presence would have changed the outcome of the war.

The most damning example that come to mind would be the Battle of Scarif. At that point, the Empire knew that a fatal weakness existed in the Death Star. So when the Rebels attacked Scarif, where the Death Star's plan was stored, it was pretty obvious what they were aiming for. So the Empire sent a massive amount of reinforcements, which lead to the rebels getting decimated. But a Corvette still manage to escape and enter hyperspace.

All the Empire needed was one Interdictor, and the rebels would have never had a chance to win, because the plans would have never left Scarif.

Obviously, the easy answer would be that there wasn't any Interdictor available close enough to the battle to make it in time. Which would raise another question, why was such a vital ship, that can completely corner an enemy and cut off their only escape route, not a mandatory part of any and all fleets?

Why were the Interdictor-class ships, which provided an incredible tactical advantage, almost never used?

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    I don't have the references available to provide evidence for a complete answer, but Interdictor-class SD have relatively weak armament, less than 1/3 of an Imperial-class. That means they're not terribly useful on their own, only in a task force with other heavy ships. Even the Empire isn't going to build thousands of these, just what they expect to need, and they'll be deployed where they're useful - which is presumably out capturing smugglers, etc. Plus, before Scarif, is the Empire even aware that the Rebels can field a force like this? – DavidW Jul 13 at 13:00
  • Related question. – Null Jul 13 at 13:03
  • @DavidW yeah but the empire has been shown time and again to not be shy from wasting resources. When Scarif happened, the empire had already been victim to many guerilla style attacks from the rebels. So they knew their M.O, the battle of Scarif was considered enough of a Crisis to even send the death star there to destroy the Archives, so adding one or two interceptors to the reinforcements does not seems to be a stretch – user3399 Jul 13 at 13:06
  • To be fair, one Interdictor-class ship wouldn't be sufficient. Send two ships in opposite directions; the SD can only follow one, so the other should be able to pull clear for a jump. (I also don't know my Star Wars physics very well, but didn't an Interdictor work by using gravity well generators? What gravity well is the destroyer creating that isn't dwarfed by Scarif's well?) – chepner Jul 13 at 13:34
  • In the pre-Disney EU, they did see common use, but like the others said, they required escort ships to provide a successful blockade – The Fallen Jul 14 at 13:43

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