Site information:

Mayfield Canyon, 0.2 mi N of Farmer Wells Meadow Ranger Station, 1.5 mi NW from intersection of Pine Creek Rd and North Round Valley Rd, then 1.5 mi N on Ranger Station Rd to site

The directions above are from the OHP.  They aren't very clear.  Mayfield Canyon is at the base of the mountains in the general vicinity of the center of these photos.  Nothing remains at the site, as far as I know

37.447164, -118.637202

Plaque information:

No plaque

OHP description:

On April 8, 1862, a body of troopers and settlers entered Mayfield Canyon (named for one of the settlers) to fight the Indians supposed to be there. However, the Indians had evacuated the canyon so the group made camp at its mouth. The next day they went up the canyon again, but this time they were forced to retreat to Owens Valley.

Registered 6/20/1935