Following the consequences of an alternate naval building program

Daniel first changes the Royal Navy's building programs, then follows the war forward using naval daily chronologies. Naval-History.net supplies the sequence against which he considers altered encounters and keeps track of losses. That method forces later events to inherit earlier changes, such as U-boats lost before they can join subsequent patrols. It also exposes how accelerated escorts, weapons, carriers, and aircraft combine over time. The resulting campaign remains a counterfactual whose losses depend on the assumptions assigned to each encounter.