Battery Weed, Sunk in the Sand

At first look the plate is nearly empty — bare sand, a low sandbag crest, a shallow basin. That is the point: Battery Weed's five 10-inch siege mortars lived in pits, below the island's surface, and a mortar battery photographed from outside is mostly the absence it hides in.

Mortars needed no embrasures and offered nothing to shoot back at; the works around them were built to disappear. Haas & Peale's title does the identifying that the ground refuses to.