What were the Japanese code words that indicated a surprise attack had been achieved at Pearl Harbor?

The phrase "Tora...Tora...Tora" was a critical code phrase used by the Japanese during the attack on Pearl Harbor. It translates to "tiger" and was used to signify that the surprise attack had been successfully achieved without detection. The use of this phrase indicated to the Japanese forces that they could proceed with their planned assault, confirming that their strategy had worked as intended.

This code phrase has historical significance as it represents the tactical achievement of the Japanese Navy during the battle. It signified a moment of triumph, allowing the forces to engage fully since the element of surprise was confirmed. The timing and execution of the attack were crucial to Japan’s planning and execution, and this phrase became iconic, representing the moment the attack was deemed successful.

The other options do not convey the specific status of the operation relating to the success of the surprise attack, thus, distinguishing "Tora...Tora...Tora" as the correct response.