To stitch, create a group of 4 vertical stitches first. When this is finished, make the large cross. Now, you will want to stitch 8 vertical stitches and then cross over the last four.
You may work the first row from left to right and the second row right to left. Be sure to create all the cross hatches in the same direction. (See the diagram)
For a variation, you may wish to make the large crosses in another thread or color.