Long ago, a big fight started. 

Long ago, a big fight began in a land called Manchuria. 
Some Japanese soldiers caused a small blast. They blamed Chinese people for the blast. 
They used the blast as a reason to fight. Many more soldiers came to take the land. This was a very sad and unfair time.
Japan took over many big cities. They stayed in the land for a long time. The people there had to face many hard things.
Today, museums tell the story of what happened. They help us remember the past.
In 1931, a big event happened in Manchuria. 
On September 18, a Japanese officer named Suemori Kawamoto used dynamite. He set off a small blast near a railway line. 
Japanese leaders blamed Chinese people for the blast. They used this as a reason to invade. Japanese troops attacked Chinese soldiers in the city of Mukden. They also took over many other large cities.
China was facing many hard problems at this time. This made it difficult to fight back. Within five months, Japan had taken over most of the land. They set up a new state called Manchukuo. Today, museums help people learn about this time in history. 
The Mukden incident was a very important event in history. It took place in a region called Manchuria in Northeast China. This area was a place where Japan and China had many disagreements. Japan wanted more control over the land and the railways there. 
To make the plan work, officers had to act carefully. Two Japanese officers, Seishirō Itagaki and Kanji Ishiwara, came up with the idea. They wanted to make it look like Chinese forces attacked a railway. They chose a spot near Liutiao Lake for the plan. 
On the night of September 18, 1931, the plan began. A Japanese officer named Suemori Kawamoto used a small amount of dynamite. He set it off near the South Manchuria Railway tracks. The blast was very weak and did little damage. Only a tiny section of the rail was affected. A train even passed over the tracks just minutes later. The Japanese military then blamed Chinese dissidents for the blast.
After the explosion, the Japanese military moved very quickly. On September 19, they attacked Chinese troops in the city of Mukden. 
Many things made it hard for China to defend the land. The Chinese government was busy with other big problems. They were also dealing with massive floods in the Yangtze River. 
The Mukden incident was a staged event used to justify a military invasion. It occurred in Manchuria, a region in Northeast China. This event is also known as the Manchurian incident. In Chinese, the specific attack is called the Liutiao Lake incident. The entire sequence of events is often called the September 18 incident. It was a false flag operation. This means military personnel staged the event to blame others. They wanted a pretext, or a reason, to start a war. 
Before the incident, tensions between Japan and China were very high. Japan had grown its economic and political interests in Manchuria since 1905. The Japanese government controlled the South Manchuria Railway. They claimed absolute administration within the railway zone. Japanese soldiers were stationed there to provide security. However, these soldiers often performed maneuvers outside the railway areas. In 1929, a conflict between China and the Soviet Union occurred. This conflict involved the Chinese Eastern Railroad. The Soviet victory revealed Chinese military weaknesses. It also showed that the Soviet Red Army was very strong. This event shook Japanese policy and accelerated plans to conquer the Northeast.
In 1931, several Japanese officers began to plot a secret invasion. Colonel Seishirō Itagaki and Lieutenant Colonel Kanji Ishiwara developed a plan. They wanted to provoke a conflict with Chinese forces. They chose a site near Liutiao Lake for the sabotage. This area was not militarily important. It was only 800 meters from a Chinese garrison called Beidaying. The plan was to cause an explosion and blame Chinese troops. This would make a Japanese invasion look like a legitimate defense. 
The execution of the plan happened on September 18, 1931. At 10:20 p.m., Lieutenant Suemori Kawamoto detonated explosives. He used a small quantity of dynamite near the railway tracks. The explosion was very weak. It only damaged a 1.5-meter section of the rail on one side. The damage was not enough to stop a train. In fact, a train from Changchun passed over the site minutes later. The train arrived in Shenyang at 10:30 p.m. without any trouble.
On the morning of September 19, the Japanese military responded to their own attack. They used artillery to fire on the nearby Chinese garrison. About 500 Japanese troops attacked the Chinese garrison of 7,000 soldiers. The Japanese also destroyed the small Chinese air force. The Chinese troops were defeated and fled. By that evening, the Japanese had occupied the city of Mukden. 
Several factors made it difficult for China to defend Manchuria. The Chinese leader Zhang Xueliang had a large army. His forces included 250,000 men, 60 aircraft, and 4,000 machine guns. However, his troops were often under-trained and poorly fed. Many soldiers lacked loyalty or had low morale. Also, many of his troops were located south of the Great Wall. This meant they were not concentrated enough to fight effectively. The Japanese Kwantung Army also had a strong reserve force. They could move troops quickly by railway from Korea. 
The Chinese government was also facing many internal problems. They were dealing with the aftermath of massive floods in the Yangtze River. These floods created tens of thousands of refugees. The government was also occupied with the Chinese Communist Party. Because of these issues, the defense of Manchuria was difficult. The incident changed the course of history in East Asia. Today, museums in Changchun and Harbin preserve the history of these events. They help people understand the complex causes of the conflict.
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