Why a commerce-raiding force needs depth

Why build multiple Panzerschiffe instead of treating Deutschland as a single technological demonstrator?

At least three ships were needed to keep one available after a loss or during maintenance. Larger batches would also let lessons from Deutschland shape later designs.

Three ships provide a minimum margin for risk: after one loss, one ship can remain available while the other trains or undergoes maintenance. A commerce-raiding strategy needs more depth than that. Four ships, or perhaps five or six, would better absorb losses and refits. A second Panzerschiff at the Battle of the River Plate is raised as an example of what extra hulls might have meant, without claiming a certain outcome. Successive batches could keep German yards active while experience with Deutschland shaped faster or better follow-ons. One possible D-class design is described as making 29 knots with armour similar to Deutschland and 105 mm or 127 mm secondary guns; a Scharnhorst follow-on might instead gamble on 15-inch main guns. Force structure depends on sustainable availability, not the nominal number of hulls.