On June 21, unaware that Crook had been stopped by the Battle of the Rosebud, the other two commanders, Gibbon and Terry, met up on a steamer at the confluence of the Yellowstone and Rosebud rivers. They agreed to trap the Indians between the two commands by moving the main body of their forces up the Yellowstone, then up what they called the Bighorn River, and then up the Little Bighorn River—the Indians’ Greasy Grass.
