The answer is easy, IMO.
During the story arc “Knightfall”, Batman is put through the gauntlet, trying to recapture every super-villain that escaped when Arkham Asylum was broken wide open, with weapons and such left for the villains to collect.
This leads to Batman getting his back broken by Bane.
And the two followup arcs, KnightQuest and KnightEnds, brings Bruce Wayne (And Batman) back into his glory.
Batman/Bruce Wayne went up against all his rogues gallery in a very short time, lost, and was able to come back.