Recipe for Hardtack

In the Civil War the main staple in the soldier's diet was hardtack- it was usually made small enough to fit in the soldier's pocket.
I have found a recipe for hardtack that is used by Civil War reenactment participants.
I have not had time to try it yet but if you would like to try your hand at it here is the recipe:
4 cups flour
2 cups water
4 teaspoons salt
Combine water, with the 4 cups of flour and 4 teaspoons of salt. Gradually adding the water will keep the mixture from becoming too sticky. Knead thoroughly. It should feel elastic-like when complete. If too sticky, add more flour.
Flour a surface for rolling out the mixture. Roll out into a rectangular shape until roughly 1/2 inch in thickness.
Cut the hardtack dough into squares. A pizza cutter works well for this. Hardtack came in various sizes, depending on the company that manufactured it, but it typically was small enough to fit into one's pockets.
Take a fork and make holes in the dough, creating a look similar to today's saltines. Flip each hardtack over and make holes on the other side as well.
Put the dough on a cookie sheet. Do not grease the cookie sheet. Bake the hardtack for 30 minutes, flip and cook for another half an hour.
I am sure that either white or whole wheat flour will work equally as well.
It does not sound like you can make a mistake with these!
P. S. With any luck I will have some pics from the Civil War re-enactment posted on the blog with in the next few days!