Most people in China and Taiwan might think they know what happened after the long and bloody civil war between the Chinese Nationalist Party and the Communist Party ended in 1949.
But recently declassified government archives have revealed a previously unknown secretive plan by Taiwan's late President Chiang Kai-shek to take back mainland China.
Chiang and his troops had fled to Taiwan after losing the war to the Communists, but despite great obstacles he was obsessed with the idea of taking back the land he had lost.
According to these newly-revealed government documents, by the 1960s Chiang thought the time was right to launch a counter-attack, given the devastating famine Mao Zedong's leadership had unleashed and the possibility China would soon have a nuclear weapon.
The US was fighting the Vietnam War then, and Chiang knew he needed US military assistance if he were to succeed, so he offered to help the Americans fight the war in Vietnam in exchange for US support.
Washington objected to Chiang's suggestions, but Chiang went ahead with his preparations anyway.
Top secret
The declassified information - photocopies of which went on public display in Taiwan for the first time in May - show that Chiang's planned offensive, called the Guo Guang [National Glory] Project, involved 26 operations including land invasions, special operations behind enemy lines and raids against the enemy.
Chiang also instructed his son Chiang Ching-kuo to come up with a plan to launch an airborne attack on southern China's Fujian and Guangdong provinces.
All of this was top secret at the time.
In 1965, the plans were ready. Soldiers and officers drew up their wills, while the top brass were trying to choose the most suitable "D-Day" to deploy their troops, according to the archives.
But Beijing had discovered the plan. On 6 August 1965, two Taiwanese naval vessels assigned to transport troops on a reconnaissance mission were sunk by Communist forces. About 200 soldiers were killed.
In November the same year, another vessel sent to drop off supplies for soldiers stationed on one of Taiwan's outlying islands was hit by Communist torpedoes, killing some 90 soldiers.
The heavy loss of life surprised Chiang Kai-shek. He then realised China had significantly improved its naval capability. Chiang was forced to scaled back and eventually abandon his plan.
But according to Gen Huang Chih-chung, who was an army colonel at the time and was part of the planning process, Chiang never completely gave up the desire to take back China.
