On August 31, 1941, four days had passed since Takeo Yoshikawa went to Wheeler Airport to watch the air show. The information Yoshikawa had collected in the last 10 days had finally been sent back to Tokyo from Honolulu in the form of diplomatic cables from the consulate.

According to the previous instructions of the Navy Command Department for Yoshikawa, if there are no special changes, Yoshikawa can report the progress of the work every ten days during this period. Moreover, the report should be carefully worded and as concise as possible.

The purpose of this was to make the telegrams sent from Honolulu back to Tokyo about the same frequency and flow as the diplomatic telegrams sent back from Stockholm, Cape Town, Naples, and other places, so as to make the Yankees who were radio listening to the consulates mistakenly believe that Japan was not particularly interested in Pearl Harbor at best, as well as other famous military ports in the world.

Previously, Yoshikawa's information had been sent back in a telegram from Consul General Kita to the Minister of Foreign Affairs in Tokyo. This is the first time that a separate report has been issued like today. There's no way, who made Yoshikawa's "harvest" in the last 10 days too much. No matter how much he compressed, he couldn't hide the contents in the consulate's working message.

The telegram sent back by Yoshikawa this time mainly contained three parts, the first of which was a routine report on the berthing of warships in Pearl Harbor. Thanks to the excellent location of Chunchaolou, Yoshikawa figured out the situation in the port for the first time. As of the 29th, there were 6 battleships, 7 cruisers, 19 destroyers, 6 barges, 2 large tankers and 5 transport ships moored in the harbor, and the number of submarines is unknown. The 2 aircraft carriers departed on the 24th and 25th, respectively, and the destination is unknown.

The second is Yoshikawa's biggest gain during this period - the historical meteorological data of Pearl Harbor. Not long ago, Yoshikawa pretended to be an astronomy enthusiast and got in touch with the amateur astronomer Mr. Saionji, who had studied meteors for more than 30 years, and asked him a lot about astronomy and climate near Pearl Harbor.

This old man who has just had a serious illness and lives alone is estimated to have been lonely for too long, and it is rare to meet someone who is willing to chat with him, and he said a lot to Yoshikawa. Most importantly, he told Yoshikawa, "Pearl Harbor hasn't experienced a single storm in more than thirty years, and the east-west mountains of Oahu are always cloudy in the north and sunny in the south." ”

This information was a treasure trove for Yoshikawa, which meant that planes could suddenly attack the harbor from the north on a cloudy day, and the time to launch the attack was not limited by the season. I believe that this good news will make Yamamoto 56 and other senior naval officials very happy!

The third part of the telegram was about the Pearl Harbor Air Force Division. At present, Yoshikawa has confirmed that of the five military airfields at Pearl Harbor, the 18th Bomber Wing of the Army Air Force is stationed at Hickam Airport, and the 14th Fighter Wing is at Wheeler Airfield. Naval aviation units are deployed at the Kanuuhi and Ford Island airfields, and there is also an Iwa airfield belonging to the Marine Corps Aviation.

The internal situation of the three airports of Kanuhei, Ford Island and Iva is not yet known to Yoshikawa. But with the "help" of Second Lieutenant Hetek, the situation of the army aviation on the island has been basically mastered by Yoshikawa. In particular, the 14th Fighter Wing at Wheeler Airfield, how many planes, how many pilots, how many runways, hangars, ammunition depots, oil depots, and maintenance workshops were all found out by Yoshikawa.

Finally, Yoshikawa also mentioned in the report that he had found two new fighters at Wheeler Airfield that were very similar to the Zero carrier-based aircraft. And the improved version of this fighter is likely to replace the aging P-36, and together with the P-40, it will become the main model of the US military fighter on the island.

Soon, this information from Yoshikawa was sent by Ogawa Osa to the desk of Admiral Nagano Shusei, the chief of the Naval Command Department.

"Very well, the recent work of the Ministry of Intelligence has been very productive!" After reading the information, Nagano Shusei said to Ogawa Daisa of the Intelligence Department with satisfaction, "Send this report to the Naval University, Yamamoto and Fukurushigeru are exactly what they need." ”

As a representative figure of the Japanese Navy's hardliners against the United States, Admiral Nagano was the actual back-of-the-scenes supporter of "Plan Z" (the surprise attack on Pearl Harbor). Although he did not make a clear statement in previous discussions due to his status as the Minister of Military Orders, this did not prevent him from using the resources in his hands to secretly help Yamamoto Isoroku enrich and improve the "Plan Z".

At this moment, at the Naval University near Meguro Station on the Tokyo Mountain Main Line, a high-level map-based exercise around "Plan Z" was being carried out in a secret room. More than 30 senior admirals of the Navy participated in the exercise, and on behalf of the Military Command Department, Rear Admiral Fukuru Shigeru, director of the Operations Department, and Osa, Tomioka, chief of the Operations Division, attended the exercise.

In addition to Commander Commander Isoroku Yamamoto, the participants of the Combined Fleet also included Lieutenant General Nagumo Tadaichi, commander of the First Air Fleet and First Air Force, Major General Ryunosuke Kusaka, Chief of Staff, Rear Admiral Tabun Yamaguchi, commander of the Second Air Force, Major General Tadashi Hara, commander of the Fifth Air Force, Lieutenant General Mikawa Gunichi, commander of the Third Combat Team, Rear Admiral Sentaro Omori, commander of the First Torpedo Force, Vice Admiral Mitsumi Shimizu, and Chief of Staff Toshinoshi Toshinosa.

Senior General Nagano Shusei and Lieutenant General Ito Junichi, Deputy Chief of the Military Command Department, were originally among the invitees, but in order to avoid expressing a position on some issues on the spot, neither of them attended. However, from beginning to end, Nagano Shushen was watching every step of the exercise. This information sent back by Yoshikawa will be of great help in enhancing the reliability of the exercise on the exercise map.

"Wait!" Ogawa Osa had just turned around and was about to leave, but was stopped by General Nagano again, "Don't mention the two American planes in the report." ”

"Understood!" Ogawa nodded knowingly. Unlike a grassroots intelligence officer like Yoshikawa, Ogawa, who is the head of the intelligence department of the Navy's command department, had heard of this kind of aircraft more than two years ago.

It's just that this aircraft is involved in a public case between the Japanese Navy and Army. At that time, the Army Aviation Corps questioned the existence of serious leaks within the Naval Air Corps on the pretext that it had encountered a new fighter in China that was very similar to the Navy's newly installed Zero carrier-based aircraft (the batch that John had previously provided to the American Volunteer Air Force for China).

This accusation made the navy embarrassed for a while, so much so that at the end of the year, the army suffered a big loss at the "spoils distribution meeting" (meeting on the allocation of budget, materials, and military production quotas), and the army robbed a lot of resources.

Later, it took nearly a year for the Navy to conduct a detailed investigation, and it was finally confirmed that the aircraft came from an American aircraft manufacturer called Hughes Aircraft Company, and that the similarity with the Zero carrier-based aircraft was just a coincidence. However, this is no longer helpful, and the quota of oil, rubber, and engine parts that the army has eaten into its mouth will not be able to get back in any case.

After suffering such a big loss, the navy is of course embarrassed to publicize this matter. So, apart from high-ranking generals and those who were once unlucky enough to be investigated as spies, most Navy personnel did not know that the United States had ever had such an aircraft.

Considering that today's exercise not only had a large number of staff officers at the level of section chiefs, but also special observers from the army participating, Nagano felt that it would be better not to mention this matter. After all, "Plan Z" involves the entire southward strategy of the empire, and if it is to be implemented, it will inevitably be submitted to the imperial court for discussion in the end. During this time, it is better to provoke as little friction between the army and navy as possible.