The meaning of this poem is:
Although the road of revolution is still long and arduous, our hero Red Army must carry it through to the end until the victory of the revolution.
translate
The Red Army is not afraid of all difficulties and hardships on the Long March, and Qianshan is just an ordinary thing in the eyes of the Red Army. Wuling Mountain is so undulating and endless, but in the eyes of the Red Army, it is like a small wave. Wumeng Mountain is as tall, majestic and magnificent, but in the eyes of the Red Army, it is like a small mud ball rolling under its feet.