The Trolloc Wars began about 1000 AB and lasted for over three hundred years. Waves of Trollocs led by Fade and Dreadlords poured out of the Blight and ravaged the world. Eventually all were slain or driven back to the Blight, but some nations were depopulated and many ceased to exist. Records from the time are fragmentary.
TEotW,Ch9 - Manetheren was destroyed during the Trolloc Wars. About two hundred years into the Wars, a massive force of Trollocs and Dreadlords attacked wiping out most of the Manetheren forces and finally killing King Aemon. Queen Eldrene, feeling his death. Countered with a blast of the One Power that wiped out the Trollocs army but also destroyed her and the entire city of Manetheren as well.
TDR,Ch19 - Mat wakes with memories of fighting Trollocs during the Trolloc Wars.
TDR,Ch22 - Sheriam tells Egwene that forcibly turning someone to the Shadow with thirteen Dreadlords and thirteen Fades has not been done since the Trolloc Wars.
KoD,Ch17 - Birgitte's earliest memories are now of the lives she led between the founding of the White Tower and the Trolloc Wars and those memories are fading.
KoD,Ch19 - Ogier fought along with men in the Trolloc Wars.