What is the name of a dry biscuit with a long shelf life?

LOVED THEM,, WHATEVER HAPPENED TO OYSTER CRACKERS, LOVED THEM TOO..

C's Dad, Do you mean the American Civil war? ~1860s. Hard tack had been used by sailors, British, European and then American, for centuries by then.

Mr. Boddy! Oyster crackers still exist! You may have to check out multiple grocery stores OR google them!

STEPHEN BODDY, you'll find oyster crackers at most grocery store.

This is similar to Pilot Bread which is an old Alaskan staple.

Nice for snacks and can be kept for other days or weeks

If you are camping out,starving, they are good with some fatback..,I had that once,,and I still like fatback today, haha you can keep the hard bread,