The following is from the book, Encyclopedia of Indian Wars, by Gregory F. Michno.
Lt. John F. Staples left Fort Baker on 29 May with a detachment of 20 men of Company A, 3rd California Infantry, on a scout for Indians. On 31 May, the soldiers headed southwest to the Eel River. One mile upriver, they discovered about 30 Indians also traveling up the river. Rushing across a small prairie, Staples attacked them, killing one man and capturing 12 women and children. He took his prisoners back to Fort Baker.
More information concerning the Eel River Campaign from the book, Indian Wars, by Bill Yenne.