What does this sound of fighting mean?

The sound of this battle refers to the "March of the Volunteers", the national anthem of the Republic of China.

The March of the Volunteers is a song written by Tian Han and composed by Nie Er. It is the theme song of the movie "Children of the Storm" and is known as the clarion call for the liberation of the Chinese nation. Since its birth in 1935 at a time when the nation was in danger, it has It played a huge role in inspiring the patriotism of the Chinese people and later became the national anthem of the Communist Party of China.

The national anthem of the People’s Republic of China is a symbol and symbol of the People’s Republic of China. All citizens and organizations should respect the national anthem and maintain its dignity.

On May 9, 1935, the first recording of the song was completed at the EMI studio. In 1951, in order to meet the needs of playing the national anthem, the People's Record Factory recorded and published a rough record composed of a brass ensemble and an orchestral ensemble.

In 1959, to celebrate the 10th anniversary of the founding of the People's Republic of China, China Record Factory recorded and published a full set of standard national anthem special records. In 1978, a special album with collective lyrics was released. In 1983, China Record Shanghai Company recorded and published a special record of the standard national anthem with the original words restored.

The March of the Volunteers was originally the theme song of the movie "Children of the Storm". In the autumn of 1934, Tian Han wrote a long poem for the film, the last verse of which was selected as the lyrics for the theme song "March of the Volunteers." Shortly after the lyrics were written, Tian Han was arrested and imprisoned by the Kuomintang authorities.

In February 1935, director Xu Xingzhi took over the filming of "Children of the Storm". Soon after, comrades who visited the prison brought back the lyrics that Tian Han wrote on the back of the cigarette box wrapper in prison. That is the original manuscript of "March of the Volunteers".

At that time, Nie Er was preparing to go to Japan to seek refuge. When he learned that there was a theme song to be written for the movie "Children of the Storm", he took the initiative to compose music for the song and promised to send back the song manuscript as soon as possible after arriving in Japan.

Nie Er quickly completed the first draft of the score after receiving the lyrics. On April 18, 1935, after Nie Er arrived in Tokyo, Japan, he completed the final version of the score and sent it to Shanghai Dentsu Film Company at the end of April. Afterwards, in order to make the melody and rhythm of the song more powerful, Nie Er and Sun Shiyi discussed and made three modifications to the lyrics, thus completing the creation of the song.