What is the poem about rushing to the battlefield in "Mulan Poetry"?

Buy horses in the east market, saddles and bridles in the west market, bridles in the south market, and long whips in the north market. I bid farewell to my parents in the morning and stayed by the Yellow River in the evening. I didn't hear my parents calling for girls, but I heard the sound of the Yellow River water splashing. I left the Yellow River in the morning and arrived at the top of the Black Mountain in the evening. I didn't hear the mother-in-law's voice calling for the girl, but I heard the chirping of the horseman on Yanshan Mountain.

Thousands of miles to go to war, and it is like flying through the mountains.

The new energy spreads to the golden watch, and the cold light shines on the iron clothes