Build stone piles of large stones, medium stones and small stones.
Dig a trench 4 inches deep and 4 inches wider than the desired thickness of the wall. using a shovel. Mix concrete in a bucket, following the manufacturer's instructions. Pour a 4-inch layer of concrete into the bottom of the trench.
Pick a large flat stone as the first stone. Set the stone at the end of the trench into the concrete. Center the stone so concrete is at the top and bottom of the stone.
Pair two large flat stones up. Set the pair vertically from one another into the concrete after the first stone. Check that the stones set level. Stagger the joints of the stones as you lay the pairs into the concrete. Check that the stones are level and continue to build the first layer.
Spread mortar over the tops of the first layer of stones with a trowel. Work in small sections. Set a second layer of stones on top of the first layer into the mortar. Stagger the joints of the second layer over the joints of the first layer. Check that the stones set level.
Stack the stones with mortar by staggering the joints until your wall is completed. Do not spread mortar over the last layer of stones. Allow your wall to dry for a few days.