What is the poem that best embodies the heroism of the Red Army's Long March?

Significance of Long March Poems of Seven Laws;

The red army is not afraid of the difficulties and obstacles of the expedition; It is common to see the hardships and hardships of Qian Shan. Wuling Mountain is so ups and downs, endless, but in the eyes of the Red Army, it is like a small billowing spray. Wumeng Mountain is so tall and majestic, but in the eyes of the Red Army, it is like a mud ball rolling under its feet.

The cliffs on both sides of the Jinsha River are warm, because the Red Army didn't spend a single soldier here. The Luding Bridge on the Dadu River spans the east and west banks. Compared with Jinsha River, there are heavy casualties here, which makes people feel deep chill. What makes the Red Army even more happy is that Minshan Mountain is thousands of miles away, covered with snow, and the Red Army has climbed over Minshan Mountain. Everyone was in high spirits and all smiles.