Why SC 122 and HX 229 need not be a turning point

Were Convoys SC 122 and HX 229 a turning point in the Battle of the Atlantic?

Not in the simplified sense of one decisive hinge; they were two important convoys whose history matters without that label.

SC 122 and HX 229 first deserve to be understood as individual Atlantic convoys. They were as critical as other sailings, and Middlebrook does not need to claim that they alone changed the war. That restraint lets the book reconstruct two particular convoy experiences without forcing them into a decisive-moment template. Their importance comes from what they reveal about the campaign rather than from a claim to uniqueness.