Mexican troops... Armed and in uniforms, OD Green uniforms and OD Green Kevlar helmets, crossed onto our host's property and were challenged verbally by our reconnaissance team. The Mexican troops, there was about ten of them, we estimate. We know for certain there were two in the lead with AK-47 and RPK machine guns. The rest of them retreated back into the wood line, and after they got themselves into a concealed position, they fired on our volunteers.