I was conducting a survey in southeastern San Diego County, near the 
Imperial County and Mexico border, near Jacumba. We found an artifact, which 
I am tentatively referring to as a cannon ball because it is perfectly spherical 
in weight. It is about 2 lb in weight and is made of lead. There is a '2' stamped 
on the surface and another side shows a slight pock mark. There is a bit of 
brown lichen growing on one area. This was the only historic artifact found on 
the survey, however over 70 other prehistoric sites, isolates and features 
were also recorded during the survey.

I am looking for a positive identification on the artifact, and also any 
information on military or border activities thay may have occurred in the area. 
Our records search had no mention at all of any historic battles.