The Battle of Grapevine Creek occurred in West Virginia during which conflict in American history?

The Battle of Grapevine Creek occurred on January 19, 1888, on the West Virginia side of the Tug Fork River which separates Kentucky and West Virginia. It was the beginning of the end, so to speak, of the feud between the Hatfields and the McCoys.

The feud started in 1865 with the murder of Asa Harmon McCoy, supposedly by Devil Anse Hatfield's Uncle Jim Vance. On January 1, 1888, Hatfields surrounded the McCoy home on the Kentucky side of the river in what would be known as the New Year's Massacre. The home was set on fire to drive out patriarch Randolph McCoy. McCoy and several of his children escaped into the woods, but his son Calvin and daughter Alifair were shot and killed, and McCoy's wife Sarah was beaten, left with broken ribs and a fractured skull. The Governor of Kentucky sent Frank Phillips and a 38 man posse to arrest the nearly 20 men involved in the murders. On January 10th, Phillips and his posse killed massacre leader Jim Vance and shot Devil Anse Hatfield's son Cap. In the following days, 3 more men from the Hatfield side were arrested.

Devil Anse Hatfield started gathering men to launch a final offensive against the McCoys, but Frank Phillips found out about the planned attack. He and his posse met them en route to the attack on the West Virginia side of the Tug Fork River. In the Battle of Grapevine Creek, 2 Hatfield supporters were killed and several were arrested afterward. Devil Anse Hatfield and a few others retreated and escaped.