What time period does "Yan'an period" refer to?

The Yan'an period refers to the 13 years that the Central Committee of the People's Republic of China (PRC) spent in northern Shaanxi, specifically from October 19, 1935, when the PRC arrived in the town of Wuqi (present-day Wuqi County) in northern Shaanxi with the Central Red Army on a long march, and settled in northern Shaanxi, to March 23, 1948, when Mao Zedong, Zhou Enlai, and Ren Bishi crossed the Yellow River to welcome the dawn of the revolutionary victory in the eastern part of the town, in Wuqi County, northern Shaanxi Province. The Yellow River in Wubao County, Shaanxi Province, to meet the dawn of victory of the revolution this nearly 13 years.

In October 1935, the Central Red Army arrived in the northwest revolutionary base area after the 25,000-mile Long March. Since then, the Party Central Committee, represented by Mao Zedong, has been fighting and living here for 13 years.

Yan'an and the Shanxi-Gansu-Ningxia Border Region became the leading center of the Chinese people's war of resistance against Japan, the general rear of the war of liberation, and the revolutionary sanctuary of the Northwest Revolutionary Base Area, a place of great popularity.

Expanded information:

Yan'an Spirit is one of the Red Revolutionary Spirits, a revolutionary spirit created by the Chinese ****anese Communist Party. Because of the birth in the holy land of the revolution, Yan'an, so the name. The main content includes: seeking truth from facts, the spirit of theory and practice, the spirit of wholeheartedly serving the people and the spirit of self-reliance and hard work. The essence is to emancipate the mind and seek truth from facts.

From 1935 to 1948, the Central Committee of China*** and Mao Zedong led and commanded the War of Resistance Against Japan and the War of Liberation here, realizing the first historic leap of combining Marxism-Leninism with Chinese reality, giving birth to Mao Zedong Thought, and laying down the cornerstone of the Chinese people*** and the country. The Yan'an spirit nurtured by Yan'an is the great spiritual impetus for the Chinese revolution and construction.