USS Spruance fired multiple rounds into the engine room of an Iranian-flagged vessel trying to run a maritime blockade. US Navy photo An Iranian-flagged cargo ship tried to bypass the US blockade in the Arabian Sea last weekend. To stop the ship, which ignored warnings, a US destroyer fired nine rounds into its engine room. The top American general shared new details about the operation on Friday. A US Navy guided-missile destroyer fired nine "inert" rounds into the engine room of an Iranian-flagged cargo vessel trying to evade the American military blockade in the Arabian Sea last weekend. Air Force Gen. Dan Caine, chairman of the Joint Chiefs of Staff, shared new details on Friday about the blockade incident, a rare use of force by the Navy against a non-combat vessel. Since the US launched its blockade of maritime traffic going in or out of Iranian ports earlier this month, 34 ships have turned around at the direction of American forces.…