From the Official Records Navy. report of Acting Rear Admiral Pearson, Commanding the Pacific Squadron, August 4, 1865, to Secretary of Navy Gideon Welles.
He had sent the USS Saranac, Captain G. H. Scott, which had been at Acapulco, Mexico, to protect American interests during an uprising against the French, had been ordered to go in pursuit of the CSS Shenandoah, then cruising in the Pacific.
Pearson then ordered the USS Suwanee to also join the search for the Confederate cruiser.
That made two ships dedicated to the search. Waddell knew Union ships were looking for him and then there was always the possibility that he might be hanged as a pirate if caught.