What are the seven-character anti-Japanese quatrains?

The Red Army is not afraid of the difficulties of the expedition, and it can only wait for thousands of rivers and mountains.

The five ridges are meandering and the waves are flowing, and the clouds are majestic and the mud balls are walking.

From: Mao Zedong's "Seven Rules·Long March".

Translation: The Red Army was not afraid of all the hardships and hardships on the Long March, and regarded thousands of mountains and rivers as extremely ordinary. In the eyes of the Red Army, the endless Five Ridges were just undulating waves, and the majestic Wumeng Mountain was nothing more than a mud ball in the eyes of the Red Army.

Creative background:

1. Memory of the Cultural Revolution connected with reality. Initially (in the 1980s) it was used to refer to the model operas that appeared during the Cultural Revolution; later (after the 1990s) people driven by nostalgia generalized it to refer to Mao Zedong's "Speeches at the Yan'an Forum on Literature and Art"

2. Works from different periods are given the same title, indicating that there is some internal consistency between the two in terms of their basic concepts, value orientations (social ideals, moral inheritance), creative paradigms, and aesthetic styles.