When was Chairman Mao's poem written in Zhongshan?

"There is a yellow storm in Zhongshan, and millions of heroes cross the river." Excerpted from a poem written by Comrade Mao Zedong in April 1949, "Seven Methods People's Liberation Army Occupied Nanjing", which was first published in "Poems of Chairman Mao" published by People's Literature Publishing House in December 1963.

The whole poem reads: "The wind and rain in Zhongshan are yellow, and millions of heroes cross the river. Tiger's dragon card is better than in the past, upside down and generous. It is advisable to chase after the poor bandits with the remaining courage, not to learn from the overlord. If the sky is sentimental and old, the world will be vicissitudes. " The whole poem not only describes the great historical event of the PLA's occupation of Nanjing, but also reveals its great significance and shows its wonderful features, which not only exhausts reason, events and feelings; Moreover, it also shows the poet's vision, innovation, aplomb and vitality, as well as his talent, courage, knowledge and strength. Based on my four balances and the trinity of things, it is the author's article.