You may have come upon a Civil War camp site, or close to one. Those are reflective of the artifacts that we used to find in the cane fields around Donaldsonville and surrounding area.
Thanks for all of the comments guys. I have some stuff showing in the What's it thread if you want to eyeball it. Wildwild Bill, The cross is 1.75 x 1 inch. Maybe silver plated. We think there was a camp there but years of plowing spread it. Roceda, River Road is still fruitfull.