Which poem did Chairman Mao write after the Battle of Lazikou?

Qingpingle Liupanshan

1935 10 month

The sky is high and the clouds are light, looking at the flying geese in the south.

If you don't reach the Great Wall, you are not a hero, but you will fight for 20,000.

At the top of Liupan Mountain, the red flag flutters in the west wind.

Holding a long tassel today, when is the black dragon?