What is the key word of the poem "Seven Laws and Long March"?

It is naturally gratifying that the Red Army crossed Wuling, Wumeng, Jinsha and Dadu and broke through the enemy's tight encirclement. The Red Army crossed Minshan again and entered northern Shaanxi.

1934 10 The Chinese Red Army of Workers and Peasants started the world-famous Long March from Ruijin, Jiangxi, in order to crush the encirclement and suppression of Kuomintang reactionaries, to preserve its own strength, and to go north to resist Japan and save the nation from peril.

The first seven laws were written by Red Army soldiers after crossing Minshan Mountain and shortly before the end of the Long March. As the leader of the Red Army, Mao Zedong has withstood numerous tests. Now, dawn is coming and victory is in sight. He wrote this magnificent poem with excitement. The Seven Laws Long March was written in late September of 1935 and finalized in June of 10.