If I can grossly break Sharpe readers into two camps (those who read just for the battle scenes, and those who read for the story of Richard Sharpe, of which battle scenes are one thrilling part), then Sharpe's Revenge is definitely for the second group. Other than the surprisingly hard-fought battle of Toulouse at the start, Revenge concerns Sharpe's (almost) one-man adventures in post-war Europe.
It's a strange world for Sharpe (and the Sharpe reader), one in which the dogged British army we've come to admire through ten books of the Peninsula War is no longer the underdog fighting overwhelming odds, but is the overwhelming force itself. Everyone knows Napoleon is doomed. Indeed, it's sad to read about the bloodshed at Toulouse because sacrifices which seemed heroic a year earlier just seemed tragically unnecessary in April 1814. What a sad thing to be the last soldier killed in a war.
Like the army, Sharpe is changing. As he gets older (he's now 36), he's losing his relish for battle and finding it harder to keep down the fear. For much of the book, his friend Frederickson is the go-getter, as Sharpe struggles with self-doubt over his post-army role, his wife's infidelities, etc.
And, after victory, the army is broken apart and Sharpe is adrift in this new world. But, of course, not for long. There's one more adventure with Harper and out of it, Sharpe's post-war world takes shape.