
The phrase waking a sleeping giant is often associated with the attack on Pearl Harbor, which led to the United States' active involvement in World War II. The phrase is attributed to Japanese Admiral Isoroku Yamamoto, who, in the 1970 film Tora! Tora! Tora!, is quoted as saying, I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve. While there is no evidence that Yamamoto ever uttered these exact words, they reflect the sentiment that Japan's strike on the US naval base inadvertently sealed its fate by provoking a powerful and determined counterattack from the United States. The phrase waking a sleeping giant thus serves as a cautionary tale, warning against provoking or arousing an opponent or force more powerful than oneself.
| Characteristics | Values |
|---|---|
| What does the phrase "sleeping giant" refer to? | In the context of Pearl Harbor, the "sleeping giant" refers to the United States of America. |
| Who is attributed with coining the phrase? | The phrase is attributed to Japanese Admiral Isoroku Yamamoto, who orchestrated the attack on Pearl Harbor. |
| Was the phrase actually spoken by Admiral Isoroku Yamamoto? | There is no indication that the phrase was ever spoken by him, but it became ingrained in the history of the attack. |
| What does the phrase "do not wake a sleeping giant" imply? | It is an idiom that means do not disturb, annoy, or provoke someone powerful who was not initially causing any trouble. |
| What is the equivalent Arabic proverb? | "إياك أن توقظ الأسد النائم" (eyaak an toqith al'asad al'naaem) |
| What is the equivalent in English? | "Let sleeping dogs lie" |
| What was the context of the phrase in relation to Pearl Harbor? | Japan's attack on Pearl Harbor awakened the "sleeping giant", leading to their defeat in World War II as the United States actively involved itself in the war. |
| What was Yamamoto's prediction about the war? | Yamamoto believed that Japan could only win the war by dictating peace terms in the White House, acknowledging the industrial and population advantage of the United States. |
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What You'll Learn

The attack on Pearl Harbor
The surprise attack on Pearl Harbor, Hawaii, on December 7, 1941, was a pivotal moment in World War II and is often referred to as the event that "woke a sleeping giant," drawing the United States into active involvement in the war. Prior to the attack, the US had maintained a neutral stance, providing support to the Allies but refraining from engaging its military in direct combat.
The Japanese strike on Pearl Harbor, a US naval base, was intended as a preemptive action to prevent the US Pacific Fleet from interfering with Japan's planned military expansion in Southeast Asia, particularly its conquest of the Dutch East Indies (known as the "'Southern Resource Area' to the Japanese). Japan sought to destroy important American fleet units, buy time to strengthen its naval power, and undermine American morale, ultimately hoping to force the US to seek a peace compromise.
The attack was orchestrated by Admiral Isoroku Yamamoto, commander-in-chief of the Japanese naval forces. Yamamoto's primary motivation was to secure access to oil in southeastern Asian countries to fuel Japan's military vehicles and naval fleet. He feared that the close proximity of the US base in Hawaii to these countries would allow the US to intervene and defend them. Despite his doubts about engaging in war with the US, Yamamoto decided to move forward with a surprise attack on the US fleet in Hawaii, aiming to destroy the US military presence in the region and leave the targeted countries vulnerable.
On November 26, 1941, 31 Japanese warships carrying fighter planes and bombers set sail towards the Hawaiian Islands. On the morning of December 7, two waves of Japanese planes launched a coordinated attack on the American warships and aircraft at Pearl Harbor. The strike resulted in significant losses for the US, with 19 naval vessels sunk or damaged and 188 aircraft destroyed. Over 2,000 servicemen and women lost their lives, and more than 1,000 were wounded.
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The US's involvement in World War II
The phrase "waking a sleeping giant" is often used to refer to the United States' involvement in World War II. Before the attack on Pearl Harbor, the US had maintained a neutral stance, providing support to the Allies through arms and resources but refraining from sending troops into battle. However, the surprise attack on Pearl Harbor by Japan on December 7, 1941, served as a pivotal moment, rousing the "sleeping giant" from its slumber.
During the early stages of World War II, the United States officially maintained its neutrality, as declared by President Franklin D. Roosevelt in the 1937 Quarantine Speech. Despite this official stance, the US actively provided aid to the Allies, including Britain, the Soviet Union, and China, through the Lend-Lease Act of 1941. American involvement also included deploying military forces to replace British troops in Iceland and engaging in early combat activities in the Pacific Theater, such as the Flying Tigers.
The attack on Pearl Harbor, a naval base in Hawaii, marked a significant turning point. In a devastating two-hour strike, Japanese warplanes sank or damaged 18 warships and destroyed 164 aircraft, resulting in the loss of over 2,400 lives. This attack led to a shift in sentiment within the United States, and Congress declared war on Japan on December 8, 1941, with Germany and Italy, Japan's allies, declaring war on the US a few days later.
The United States' entry into World War II had a profound impact on the course of the war. Over ten million American troops were sent overseas, and those who remained on the home front dedicated themselves to supporting the war effort. Women played a crucial role, taking on jobs in aircraft manufacturing plants, munitions plants, and military uniform production factories. Rationing programs were implemented, and civilians participated in recycling and scrap metal drives to contribute to the military's resource needs.
The US Navy captured islands within bombing range of the Japanese home islands in June 1944, enabling strategic bombing campaigns that destroyed major Japanese cities. The Battle of Midway in June 1942 marked a significant defeat for Japan, as American code breakers had deciphered their plans, allowing the US to strike back effectively. The US also employed island-hopping tactics to move air bases closer to Japan, capturing Okinawa in the spring of 1945. Ultimately, the atomic bombings of Hiroshima and Nagasaki, coupled with the Soviet invasion of Manchuria, led to Japan's surrender on September 2, 1945, bringing an end to World War II.
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Admiral Isoroku Yamamoto's quote
The quote "I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve" is attributed to Japanese Admiral Isoroku Yamamoto, who planned the attack on Pearl Harbor. The quote is said to have been written in his diary, but there is no printed evidence to prove that Yamamoto made this statement. Randall Wallace, the screenwriter of the 2001 film Pearl Harbor, admitted that he copied the line from the 1970 movie Tora! Tora! Tora!, whose director, Richard Fleischer, stated that while Yamamoto may never have said those words, the film's producer, Elmo Williams, had found the line in Yamamoto's diary. Williams, in turn, has stated that Larry Forrester, the screenwriter, found a 1943 letter from Yamamoto to the Admiralty in Tokyo containing the quotation. However, neither Forrester nor anyone else, American or Japanese, can recall or find the letter.
Yamomoto's prediction about the future outcome of a naval war against the United States is also quoted: "I can run wild for six months... after that, I have no expectation of success". As it happened, the Battle of Midway, the critical naval battle considered the turning point of the War in the Pacific, concluded exactly six months after the Pearl Harbor attack.
Yamamoto's quote about peace terms in the White House was abridged by Japanese propaganda to sound like an optimistic prediction, which was then picked up by American propaganda to appear even more boastful.
Another quote attributed to Yamamoto is: "A military man can scarcely pride himself on having 'smitten a sleeping enemy'; it is more a matter of shame, simply, for the one smitten. I would rather you made your appraisal after seeing what the enemy does, since it is certain that, angered and outraged, he will soon launch a determined counterattack."
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The power imbalance between Japan and the US
The phrase "waking a sleeping giant" is often used to refer to Japan's attack on Pearl Harbor, which marked the United States' entry into World War II. The attack united the US against Japan and ultimately led to Japan's defeat. This historical context highlights the power dynamics between the two nations.
In more recent times, the power imbalance between Japan and the US has been evident in their economic and military relations. Economically, there has been a downward trend in Japan's trade surplus with the US. Since 1990, Japan's trade surplus with the US has decreased, reflecting an expansion of Japanese imports of American manufactured goods alongside a slowdown in Japan's overall export growth. Additionally, the share of the US trade deficit held by Japan has also been on a downward trend as exports of American products to Japan continue to grow.
Militarily, the US and Japan have found common ground in their response to China's growing influence in the South China Sea. China's massive military buildup has created a power imbalance with Southeast Asian nations, including those in the ASEAN bloc. The US and Japan, as two of the strongest military powers in the region, have a responsibility to protect peace and maintain a balance of power. However, the relationship between the US and Japan has been described as cold and distorted, with Japan's status and identity in the alliance sometimes questioned.
To address the power imbalance between Japan and the US, Japan may need to focus on sustained economic growth and diversification away from China. At the same time, the US can play a role in encouraging economic balance by continuing to increase its exports to Japan. In the military realm, the US and Japan must work together to counter China's aggressive posturing in the South China Sea and ensure the security of the region.
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The US's response to the attack
The United States' response to an attack has varied depending on the context and the nature of the attack. Here are some examples:
Response to the Attack on Pearl Harbor
The attack on Pearl Harbor by Japan served as a pivotal moment in the history of the United States, marking the country's transition from neutrality to active involvement in World War II. The sentiment of the nation shifted, and the US eventually sent over ten million troops to war. This response demonstrated a decisive shift in US foreign policy and a determination to counter the threat posed by Japan.
Response to Houthi Attacks
The US has also responded to attacks by Houthi rebels in Yemen. In March 2025, the US launched a "decisive and powerful" wave of airstrikes against Houthi targets. This response was triggered by Houthi attacks on shipping in the Red Sea, including the targeting of US military and commercial vessels. The US government justified its actions by citing the need to counter Iranian influence and support for the Houthis, with President Donald Trump threatening to use ""overwhelming lethal force" to achieve US objectives.
Response to Drone Attack on US Troops in Jordan
In January 2024, the US faced another challenge when a drone attack by Iran-backed militants targeted US troops in northeastern Jordan, resulting in casualties. President Joe Biden found himself under pressure to respond decisively while also navigating the delicate balance of avoiding a wider war in the region. While Biden did not publicly disclose the specifics of his response, he affirmed that he held Iran responsible for supplying weapons to the militants.
In each of these instances, the United States demonstrated a willingness to defend its interests and allies, adapt its foreign policy, and employ military force when deemed necessary. The responses varied in scale and strategy, reflecting the complex nature of international relations and the specific circumstances surrounding each incident.
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Frequently asked questions
"Waking a sleeping giant" is an idiom that means provoking or arousing a powerful entity that was not initially causing any harm.
Japan's attack on Pearl Harbor, a naval base in Oahu, led to the United States of America's active involvement in World War II. This involvement would eventually lead to Japan's defeat in WWII.
The phrase is attributed to Japanese Admiral Isoroku Yamamoto, who is said to have uttered it after the attack on Pearl Harbor. However, there is no concrete evidence to support this claim.
"Don't wake a sleeping giant" is a warning against provoking or arousing a powerful entity that is currently inactive. It implies that taking such an action could lead to unintended consequences.






































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