What does Chen Yi mean by meiling three chapters?

1934 10, the red army began its long March. At that time, Comrade Chen Yi was seriously injured and stayed in the Central Soviet Area to persist in the struggle. Later, when the Central Soviet Area fell, he launched guerrilla warfare in the Jiangxi-Guangdong border region. 1April, 936, he went to Meishan area to inspect the work. 10, because of the traitor's betrayal, Comrade Chen Yi was in distress in Dayuling and immediately turned back to Meishan. After returning to Meishan, he was temporarily hidden in a ravine. The enemy is in Yamakaji. The mountain fire was doused by rain. They searched around the mountain until it was dark, and then rushed back in the middle of the night like tigers, but they still found nothing. In those days, Comrade Chen Yi cut a flat land one foot wide and five feet long with a knife on a steep slope and lay there to rest. Later, the enemy learned from the traitors that there were "big shots" on the mountain and searched the mountain again. It took more than twenty days to "clear the field". These three poems are.