9h 51min, sep 2, 1862 y - Battle of birch coulee
After losing many men, Sibley rests at fort Ridgely. He sends out a burial party to bury the dead civilians. The burial party is ambushed and come into a one of the hardest battle of the war. For 36 hours, the soldiers are fighting. Then they are saved by a detachment to fort Ridgely.
Added to timeline:
Dakota war timeline: Nicole Anderson