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In T.A. 2489, the Easterlings drove many of the Northmen south of the Dale north, wreaking havoc and causing great destruction in the area. Many small settlements were burnt, and hundreds enslaved.
T.A. 2590: Founding of Erebor & Dale
Driven from the north, the dwarves led by Thror march to the Lonely Mountain, and found the city of Erebor. In payment to the men who inhabit the Dale for the rites of settlement, the dwarves provide the men of the region with arms and armor of dwarvish make, allowing them to drive back the Easterling threat. The first true Lord of Dale, Riddard, leads an army against the Easterlings and drives them back. On his return, he founds the city of Dale and the people of that region are united.
T.A. 2590 - 2720: Time of Plenty
As Erebor prospered, so did Dale. Even Esgaroth down on Long Lake grew, and the Free People of the North were proud. The Lordship of Dale passed in 2635 to Riddard's son, Brynn, who served as a just and humble ruler of the Dale. Brynn served from 2635 to 2665, when he was felled by the poisoned arrow of an Easterling assassin. Being without heir, his brother Cerion took the Lordship in 2665, and served long until 2720 when he passed quietly on his throne. And so Girion, son of Cerion, Lord of the Dale, came to rule in the spring of T.A. 2720.
T.A. 2720 - 2758: Lordship of Girion
T.A. 2758 - 2759: The Long Winter
T.A. 2770: The Fall of Dale