A Delay that Ruined a Good Plan

Seven groups of B-17 heavy bombers, with a total of 146 airplanes, took off for Regensburg on August 17th. Soon as they crossed the coast into Europe, they were intercepted by German fighters, which harried them with mounting ferocity all the way to Regensburg.
Of two fighter groups scheduled to escort them part of the way, only one showed up on time to protect the lead bombers. The other fighter group showed up fifteen minutes late. In that quarter hour, German fighters attacked the unprotected B-17s with abandon. Fifteen bombers were lost before the German fighters, low on fuel and out of ammunition, returned to their airfields.

The Regensburg force dropped its bombs against light antiaircraft fire, and turned south for North Africa. The Germans had not expected that, and did little to challenge their escape. Nine more airplanes were lost en route due to mechanical failures or running out of fuel, for a loss of 24 bombers. Another 60 of the 122 surviving B-17s were damaged. The Schweinfurt force got it far worse.
230 B-17s, divided into twelve groups, took off that morning, but they had been delayed and started late. Thus, they did not fly simultaneously with the Regensburg force to overwhelm the German defenders with numbers. Instead, German fighters had time to concentrate against the Regensburg force, maul it, return to their airfields to refuel and rearm, then take to the air again in time to challenge the Schweinfurt force.



