Thousands of miles of rivers and mountains are full of blood, where does it come from?

From a contemporary poem by an unknown patriotic poet. The original text is as follows:

It doesn’t matter if the swords are at war with each other. China has never been afraid of wolves.

United as one to face the national crisis, they immediately cut down the great powers with a horizontal sword.

Thousands of miles of mountains and rivers are full of passion, and China is full of good men and women.

He Xi wears golden armor in a hundred battles, even if he dies, he does not dare to be ashamed of Yan and Huang.

Translation:

It is not important to be at war with each other. When has the Chinese nation ever been afraid of jackals, tigers and leopards?

The sons and daughters of China are united and face difficulties together. The sons and daughters of China hold weapons in hand and gallop on horseback to resist the Western powers.

Thousands of miles of mountains and rivers are full of passion, and China is full of good boys.

Thousands of miles of mountains and rivers are places where the Chinese nation sheds its blood. There have been so many border-guarding heroes on this land for thousands of years.

The soldiers guarding the border have gone through hundreds of battles, and their armor has been worn out. Even if they die for the country, they cannot be ashamed of the descendants of the Chinese people.