Comes with a hand-signed Certificate of Authenticity

*THESE COMBINED CHIEF OF STAFF 1945 OPERATION DOWNFALL (JAPAN) INTELLIGENCE INVASION MAPS ARE OF THE SAME RARITY AS THE BIGOT OPERATION OVERLORD D-DAY PLANNING MAPS.

This extremely rare and museum-grade World War II artifact is an original “CONFIDENTIAL” marked Operation Downfall FIRST PROOF planning map used by the Combined Chiefs of Staff (CCS) during the top secret planning of mainland Japan. The Combined Chiefs of Staff (CCS) was the supreme military staff for the United States and Britain during World War II. It set all the major policy decisions for the two nations, subject to the approvals of British Prime Minister Winston Churchill and U.S. President Franklin D. Roosevelt.

Operation Olympic was a planned Allied (American and British) invasion during World War II, intended as the first major phase of Operation Downfall, which was the overall Allied plan for the invasion of the Japanese home islands. Set to begin in November 1945, Operation Olympic aimed to capture the southern Japanese island of Kyushu as a staging area for the subsequent invasion of the main island, Honshu, under Operation Coronet. The preparation for Olympic involved intricate planning, massive troop mobilizations, and considerable logistical challenges. It was expected to be the largest amphibious operation in the history of warfare, overshadowing even the D-Day landings in Normandy.

This Operation Downfall double-sided Combined Chiefs of Staff (CCS) intelligence planning map is one of only a handful that still exist as these intelligence maps were closely guarded due to the invasion information they contained.

SIDE ONE is titled “NOBEOKA”

SIDE TWO is titled “OITA VICINITY”

Nobeoka and Oita, both located on the island of Kyushu in Japan, were strategically significant in the Allied planning for Operation Downfall, specifically for Operation Olympic, the proposed initial phase aimed at seizing and securing the southern part of Kyushu. Their roles in the planning of this massive amphibious and land operation were rooted in their geographic locations, infrastructural capacities, and strategic importance in facilitating a successful invasion and subsequent operations across Japan.

Nobeoka

1. Geographic Significance:

Nobeoka is located in the northern part of Miyazaki Prefecture on the east coast of Kyushu. Its strategic position near the Hyuga Sea made it an important target for controlling northeastern Kyushu and for providing a northern front to the main landings expected further south.

2. Target for Air and Naval Bombardment:

Given its coastal location and the presence of Japanese military facilities, Nobeoka was expected to be a target of pre-invasion aerial and naval bombardment. The objective was to weaken Japanese coastal defenses, disrupt communication and supply lines, and soften up the area for a possible landing or to prevent the Japanese from reinforcing the southern regions more heavily targeted.

3. Potential Landing Site:

While Nobeoka was not one of the primary landing sites like those planned for Kagoshima, Ariake, and Koshikijima, it was considered as a secondary landing site that could be used to support the main efforts or to exploit once the initial landings had secured beachheads further south. Its use would depend on the progress of the campaign and Japanese defensive strength.

4. Diversion and Containment:

Nobeoka could serve as a point of diversion, drawing Japanese forces northward away from the main southern landing sites, thus diluting enemy strength where the primary landings would occur. Moreover, securing Nobeoka would be crucial for containing Japanese forces within the region and preventing them from moving south to reinforce other areas.

Oita

1. Strategic Location and Infrastructure:

Oita's location on the eastern coast of Kyushu, along with its developed infrastructure, including ports and airfields, made it a significant target for the Allies. Controlling Oita would provide the Allies with valuable logistical and operational bases necessary for sustaining the invasion forces and supporting further operations on Kyushu and beyond.

2. Air and Naval Base Neutralization:

Oita was home to several Japanese military installations, which would need to be neutralized to ensure air superiority and naval safety in the region. The Allied plans included intensive bombing campaigns to destroy these facilities before the main landings commenced, reducing the threat of Japanese air and sea attacks.

3. Amphibious Operations:

Oita, with its coastal access and port facilities, was a prime candidate for amphibious operations. The Allies needed secure, deep-water ports to unload men, material, and equipment, making Oita a strategic necessity for the logistics chain.

4. Spread of Forces:

Securing Oita would allow the Allies to spread their forces across a broad front, making it more difficult for the Japanese to concentrate their defenses. This would also facilitate a northward advance towards the Japanese heartland, supporting the broader strategic objectives of Operation Downfall.

In the grand scheme of Operation Downfall, Nobeoka and Oita were integral to the multifaceted approach planned by the Allies. They offered strategic value not only through their potential as landing sites and logistical hubs but also as targets in undermining Japanese military strength on Kyushu. The meticulous planning for their capture reflects the depth and complexity of the Allied military strategy aimed at decisively ending World War II. While these operations were never implemented due to Japan's surrender following the atomic bombings, the plans for Nobeoka and Oita highlight the comprehensive military and logistical efforts that were poised to be executed in the final stages of the Pacific War.

The Role of the Combined Chiefs of Staff in Planning Operation Downfall during World War II:

During World War II, the Combined Chiefs of Staff (CCS) played a crucial role in the planning of Operation Downfall, which was the codename for the proposed Allied plan for the invasion of Japan. The CCS was an amalgamation of the British Chiefs of Staff Committee and the American Joint Chiefs of Staff. This unique Anglo-American body was established to oversee the strategic direction of the Allied war effort and to facilitate cooperation between the British and American military services.

Formation and Function of the Combined Chiefs of Staff

The Combined Chiefs of Staff was formed following the Arcadia Conference in Washington, D.C., in late 1941 and early 1942. This body allowed the highest-ranking military leaders from both nations to coordinate their strategies efficiently and to plan major operations in a unified manner. The CCS was critical in deliberating and shaping strategic decisions across the various theaters of the war, ensuring that resources were allocated in line with overall Allied priorities.

Planning for Operation Downfall

As the war in the Pacific progressed towards Japan, it became clear that an invasion might be necessary to compel Japanese surrender. Operation Downfall consisted of two major parts: Operation Olympic and Operation Coronet.

1. Operation Olympic: Scheduled for November 1945, this was planned as the initial invasion of the southern island of Kyushu. It aimed to secure airfields and a staging area to support the larger subsequent invasion.

2. Operation Coronet: Slated for the spring of 1946, this operation involved the invasion of the main Japanese island of Honshu, and the capture of Tokyo.

The Role of the CCS in Planning

Strategic Planning: The CCS's role in planning Operation Downfall was multifaceted, involving strategic, operational, and logistical dimensions. They assessed intelligence reports, evaluated the strength and disposition of Japanese forces, and deliberated on the estimated casualties and the requirements for air, naval, and land forces.

Coordination of Resources: One of the critical challenges was the allocation of resources between theaters of war. Even as plans for Operation Downfall were being refined, the CCS had to balance resources between the Pacific and European theaters. This included decisions on the production and deployment of new weapons, like the allocation and potential use of atomic bombs.

International Collaboration: The CCS facilitated discussions and planning between British and American forces regarding the Pacific, despite the primary American responsibility for this theater. British forces were expected to contribute significantly, especially in naval and air support roles.

Contingency Planning: The CCS also had to consider alternatives to an invasion, including blockade and bombing strategies aimed at inducing a Japanese surrender without a costly land invasion.

Impact of the Atomic Bomb on Planning

The development of the atomic bomb and its eventual use in August 1945 dramatically altered the strategic landscape. The CCS had been informed of the Manhattan Project and its progress, and by mid-1945, the possibility of using the atomic bomb became a critical factor in their deliberations. The successful test of the atomic bomb in July 1945 (Trinity test) and its subsequent use on Hiroshima and Nagasaki in August led to Japan's surrender and rendered Operation Downfall unnecessary.

The Combined Chiefs of Staff played a pivotal role in the planning of Operation Downfall by ensuring a coordinated Allied approach to what would have been the largest amphibious invasion in history. Their efforts in planning, resource allocation, and strategic decision-making underscored the importance of joint command structures in modern military operations. The use of atomic weapons ultimately obviated the need for the invasion, but the detailed plans developed under the auspices of the CCS demonstrate the complexity and scale of the proposed operation. This planning effort was crucial in preparing for a potential invasion if the war had not ended following the bombings of Hiroshima and Nagasaki.

Full History of Operation Olympic:

Operation Olympic was a planned Allied invasion during World War II, intended as the first major phase of Operation Downfall, which was the overall Allied plan for the invasion of the Japanese home islands. Set to begin in November 1945, Operation Olympic aimed to capture the southern Japanese island of Kyushu as a staging area for the subsequent invasion of the main island, Honshu, under Operation Coronet. The preparation for Olympic involved intricate planning, massive troop mobilizations, and considerable logistical challenges. It was expected to be the largest amphibious operation in the history of warfare, overshadowing even the D-Day landings in Normandy.

Strategic Context

By mid-1945, Japan's situation was dire. The country had suffered extensive bombing raids, naval blockades, and the crippling defeat of its navy. However, the Japanese military and government were prepared to defend the homeland fiercely, adopting a strategy of causing maximum casualties to force a negotiated peace. This context set the stage for Operation Olympic, part of a larger strategy to bring about a swift end to the war without the projected heavy Allied casualties.

Planning and Preparations

1. Objectives of Operation Olympic

The primary objective of Operation Olympic was to establish a significant presence on Kyushu. This would facilitate the launching of further operations and enable tighter control of the seas around Japan, particularly the Korea Strait, thereby cutting off Japanese forces in Manchuria from retreat or reinforcement back to the homeland.

2. Forces and Equipment Involved

Operation Olympic called for a vast array of personnel and equipment. The plan involved more than 14 divisions from the U.S. Army and Marine Corps. The Sixth Army, under General Walter Krueger, was designated as the primary formation for the initial landings, supported by a vast naval fleet including British Royal Navy units, and a powerful array of aircraft from the U.S. Navy and Army Air Forces.

3. Tactical Planning

The invasion plan was detailed and complex, involving landings at multiple points on Kyushu’s western and southern shores. These landings were to be supported by pre-invasion aerial and naval bombardment intended to neutralize Japanese air and sea capabilities as much as possible. The Allies also planned to use airborne assaults to capture key positions inland.

Logistical Challenges

The logistics of mounting such a vast operation were daunting. Supplies, equipment, and hundreds of thousands of troops needed to be transported halfway around the world. The Allies had to build and enhance bases, ports, and airfields on captured Pacific islands and the Philippines. Additionally, ensuring supply lines remained open and capable of supporting the ongoing battle was a monumental task, involving thousands of ships, aircraft, and ground transport vehicles.

Japanese Defenses

Anticipating an Allied invasion, the Japanese prepared extensive defensive measures under the codename Operation Ketsu-Go. The strategy was to fortify beaches, improve infrastructure for troop movements, conserve scarce resources, and prepare the civilian population for home defense. On Kyushu, the Japanese deployed a substantial number of troops, including several well-equipped divisions and numerous kamikaze aircraft. The goal was not merely to repel an invasion but to inflict such severe losses that the Allies would reconsider their strategy.

Potential Casualties and Ethical Considerations

U.S. planners estimated very high casualties for Operation Olympic, with some estimates running into hundreds of thousands. The prospect of such high losses weighed heavily on military planners and political leaders. This grim outlook led to considerations of alternative means to end the war, including tightening the naval blockade and increasing aerial bombing, which were already having significant effects on Japan's ability to continue the war.

Operation Olympic was an unprecedented military endeavor that never came to fruition but highlighted the scale and complexity of Allied military planning during World War II. The operation’s preparation involved enormous effort and resources, which underscored the Allies' determination to end the war decisively. Although the atomic bombings and Japan’s subsequent surrender preempted the need for Olympic, the planning for the operation offers valuable insights into the logistical and tactical challenges of large-scale amphibious assaults, as well as the grave ethical and strategic considerations faced by wartime leaders.