>>510199630the black banner carried by Prophet Muhammed is called the Banner of the Eagle ุฑุงูุฉ ุงูุนูุงุจ rayat al-aqab
it was a black cloth made from Aisha's hijab. it is also said the Messiah will arrive carrying it.
why they called a black flag an "eagle" no one in Islam can tell you, no info about it, it just is okay?. If they're using an actual eagle as the symbol then they know what it means. it's a war symbol so they all probably plan on leaving at some point, in an army.