What is the poem that reflects the author's revolutionary optimism in the Seven Laws Long March?

The poem that embodies the author's revolutionary optimism in the Seven Laws Long March is: I prefer the snow in Minshan, and I will be full of faces after the three armies.

The original poem is as follows:

Mao Zedong's Seven Laws and the Long March

The red army is not afraid of the expedition, and Qianshan is just idle.

Wuling makes waves, and Wumeng takes mud pills.

Jinsha River is warm in the clouds and cliffs, and Dadu Bridge is cold with the cross rail.

I'm glad to see that Minshan Mountain is covered with snow and stretches for miles. Our soldiers crossed it and showed a bright smile.

Poetic:

The red army is not afraid of the difficulties and obstacles of the expedition; Take the hardships and hardships that have passed through the thousands of waters in Qian Shan as ordinary things;

Wuling mountain range is so ups and downs, endless, but in the eyes of the red army, it is like a small billowing spray;

Wumeng Mountain is as tall and majestic, but in the eyes of the Red Army, it is just a mud ball rolling under its feet;

On the cliffs on both sides of the Jinsha River, the rushing water beats against the towering cliffs on both sides, giving people a warm feeling;

The Luding Bridge on the Dadu River spans the east and west banks, leaving only a dozen iron cables, which makes people feel deep chill.

What makes the Red Army even more happy is that the mountains are thousands of miles away and covered with snow. The Red Army crossed the Minshan Mountain, and everyone was in high spirits and all smiles.

Background:

1934 10 In order to crush the encirclement and suppression of the Kuomintang reactionaries, the Chinese Red Army of Workers and Peasants went north to resist Japan and save the nation, and started the world-famous 25,000-mile Li Long Long March from Ruijin, Jiangxi. Along the way, the Red Army soldiers defeated the enemy countless times. They waded across mountains and rivers, crossed the ups and downs of Wuling Mountains, broke through the natural barrier of Wujiang River, crossed Chishui River, crossed Wumeng Mountain, skillfully crossed Jinsha River, flew over Luding Bridge, crossed snow-capped mountains, crossed grasslands and finally crossed Minshan Mountain. After passing through eleven provinces, it arrived in northern Shaanxi on June 1936+00.