"After a hundred battles, a general dies, and after ten years, a strong man returns" comes from Mulan's poem. What does this mean?

After years of fighting, countless soldiers died for their country, and only the brave who fought many battles returned home in triumph ~

From-Mulan Ci

Chatting, Mulan is knitting at home. I don't smell the loom, only the woman's sigh. What is this woman thinking? Ask the woman what she remembers. Women have nothing to think about, and women have nothing to remember. Last night, I saw the military post, and Khan ordered more soldiers. The military books have 12 volumes, all with the names of lords. Grandpa has no eldest son, Mulan has no big brother, and she is willing to be a pommel horse, so she will sign for him from now on. Buy horses in the east, saddles in the west, reins in the south and whip in the north. Go to say goodbye to your parents and stay by the Yellow River at dusk. I didn't hear my parents calling for a female voice, but I heard the Yellow River splashing. Say goodbye to the Yellow River and go to Montenegro at dusk. I can't hear my parents calling for a female voice, but I hear the chirping of Yanshan Huqi. Wan Li to Rongji, the mountain is flying. The breath of the new moon is golden, and the cold light is iron. The general died in battle, and the strong man returned in ten years.