In what event did the slogan "Help the Qing Dynasty to destroy the foreign countries" appear? What is the significance of this matter?

The slogan of the Boxer Movement is "Help the Qing Dynasty to destroy the foreign countries". Significance: Although the Boxer Rebellion was regarded by the west as an exclusive movement to help the Qing Dynasty, it did weaken the ruling ability of the Qing government to a great extent. Empress Dowager Cixi and her heirs, who continue to hold the throne, also realized that no matter what their previous attitudes were, China was bound to carry out reforms in order to avoid the demise of the Qing Dynasty. The Boxer Movement in the late Qing Dynasty, the May 4th Movement against Article 21 and the May 30th Movement of the Republic of China were three major mass nationalist movements in modern China to resist imperialist aggression. The May 4th Movement was mainly an anti-imperialist political sovereignty aggression, while the Boxer Movement and the May 30th Movement were anti-imperialist political, economic and cultural aggression movements, which lasted longer and had a far-reaching impact.