What dose the line in the national anthem mean "bloody flag is raised

The song was written and composed in 1792 by Claude Joseph Rouget de Lisle in Strastburg during the French Revolution, and was originally titled "Chant de guerre pour l'Armée du Rhin". It was adopted as the national anthem in 1795. It acquired its nickname after being sung in Paris by people marching on the capital.

I think I THINK it means the people that died fighting for our country. I'm not sure if it's correct though

The native americans, spanish, french and americans all name places in our state. the word “arkansas” came from the quapaw indians, by way of early french explorers. at the time of the early french exploration, a tribe of indians, the quapaws, lived west of the mississippi and north of the arkansas river.