China's war against Vietnam was a war that broke out in southern China between the end of the 19th century and the beginning of the 20th century due to the Vietnamese independence movement and the French colonial invasion of Vietnam. The reason for this war was complicated, involving politics, economy, culture, and many other aspects. Although this war left a deep mark in history, history books usually did not specifically record this war because the scale of this war was relatively small, and its impact on Chinese history, culture, and society was relatively small. In addition, because Vietnam was a French colony at that time, the Chinese government and people did not directly participate in Vietnam's colonial rule and invasion. Therefore, this war was not an ethnic conflict or political struggle between China and Vietnam, but the result of foreign forces interfering in China's internal affairs. Therefore, history books usually did not view this war as part of China's internal political struggle. Instead, it was described as one of the manifestations of external forces invading China.