It was not a complete failure. At least they had sink a couple of ships, destroy enough facilities for the base not to be used immediately for a counterattack.

They knew that the Americans will eventually recover. They would want to gain all of their target colonies and get the Americans to settle for a deal to accept them as the colonies master of those places that they had conquered.

Only a few especially those whom had been to the United State before truly know that it is a matter of time before their eventual defeat.