The Redgrass Field ÔÇö the First Blackfyre Rebellion
Daemon Blackfyre rose against his half-brother Daeron II and very nearly won. It ended on a field of red grass with Daemon and his twin sons shot down by Bloodraven's archers, and Bittersteel carrying the black dragon banner into exile across the narrow sea. The realm's next three generations are shaped by men who were either there or wish they had been.
The fuller tale
Daemon Blackfyre rose against his half-brother Daeron II twelve years after their father's death, and he very nearly won. He had the better claim in the eyes of nobody and the better case in the eyes of a great many: he looked like a warrior king and Daeron looked like a scholar; he was the sword and Daeron was the book; and Daeron had married a Dornish princess and brought Dorne into the realm, which a certain kind of lord found unforgivable.
The war turned on the Redgrass Field. Daemon and his sons held the centre and were winning it ÔÇö he is said to have killed men all morning and to have stopped, twice, to send his own maester to a fallen enemy, which is the detail that explains why people followed him.
It ended from the flank. Bloodraven, the king's own half-brother and Daemon's, came out of the wood with a company of archers and put arrow after arrow into Daemon and both his eldest sons on the ridge. Bittersteel ÔÇö another of Aegon the Unworthy's bastards, on the other side ÔÇö cut his way to the bodies, took the sword, and got the surviving Blackfyre children across the narrow sea.
The men it made
Three of Aegon IV's bastards decided the next century between them. Bloodraven became Hand of the King and the most feared man in Westeros, running a spy network so effective that people said he had a thousand eyes and one, and had Bittersteel's brother executed without trial in a way that cost him a great deal of goodwill.
Bittersteel founded the Golden Company in exile, an army of Westerosi outcasts sworn to put a Blackfyre on the Iron Throne, and its bones are still carried at the front of the column a hundred years later. Their motto ÔÇö beneath the gold, the bitter steel ÔÇö is his name and his temper.
Every one of the men who mattered in the next fifty years was either on that field or spent their life apologising for which side their father had been on.
Elsewhere in the wiki
 See the world as it stood in 196 AC What became of it  if an ending is written, it is here. Spoilers.
The chronicle records no ending here ÔÇö or none the maesters have set down.