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Yep. If you are crafty, you can get it going to the point where it isn't going to be stopped: No Point Defence can halt a rock the size of a small country.
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And not just as even strategic level ortillery. In a sci-fi setting with FLT drives there's generally some way to work the physics to turn an asteroid into an extinction level event for a habitable planet. Either slam the asteroid into the planet at high fraction C velocities or for "jump" sort of systems, materialize one or more rocks the size of Delaware or larger on fault lines.
The fact that Traveler 2300/2300AD's FTL system seems expressly written to preclude that sort of thing makes me certain someone started talking about it during the Great Game they played to get that setting's backstory done.