Operation Tranquil Sea

Operation Tranquil Sea was the final maritime engagement in the West War, fought between the forces of the Royal Yopei Navy and the Aradian Navy. It was a decisive victory for the Federation of Aradia, which forced the Kingdom of Yopei to sue for peace. The leading Yopeian officer of the Operation, Iwata Bousai, blames Yakaro Piririki for the Yopeian failure, due to the "Radio Signal Mishap".

Radio Signal Mishap
During the intense carrier chase conducted by Iwata Bousai against the oblivious Aradian Prime Carrier Task Force, the stranded Vice-Admiral Yakaro Piririki sent a radio signal to Iwata's fleet. This Radio signal was caught by the Lightning Carrier Force and the Aradian Prime Carrier Task Force. The Aradian's immediately located the Lightning Carrier Force and launched their air groups.

In the following few hours, the entire Lightning Carrier Force was sunk by the Aradian Carrier groups. Iwata survived the battle and began to blame Yakaro for his defeat.