We are told that Admiral Yamamoto Isoroku recorded those words in his diary when he learned that the Nipponese ambassador to the United States had not delivered the message that broke off diplomatic relations to Secretary of State Cordell Hull until well after the bombs had begun to drop on Hawaii.
The good admiral had lived and studied in the United States. He had to know that Americans would pull together and respond.
It is said that Admiral Yamamoto said to those around him, "Gentlemen, we have just kicked a rabid dog."
Yeah, well, you should have thought of that earlier. Maybe you could have avoided this: