Recreating a Revolutionary War-era hardtack uncovered a surprising storage secret

I was digging into how soldiers sustained themselves on campaign and found conflicting accounts about the longevity of their hardtack. Original recipes from the late 1700s were vague, often just listing flour, water, and salt, but diaries mentioned biscuits lasting years without spoilage. The mystery hinged on whether they used a specific baking technique or an additive lost to time. My hack involved testing different oven temperatures and storage conditions, like sealing some in iron pots versus cloth sacks. After several batches, I realized that double-baking at a low heat, then cooling completely before a second bake, created an ultra-dry product that repelled moisture. Storing it with dried lavender, which has natural antifungal properties, mirrored historical mentions of herb-lined barrels. This simple method might explain how those rations endured harsh conditions, solving a small but tangible piece of culinary history.