Keeping track of the various Sharpe books is not an easy task, as they tend to be repetitive in plot structure, usually having super-soldier Richard Sharpe caught up in a silent conflict with an officer on his own side and in an open conflict with a bully among the civilians. More often than not, there's also a damsell in distress that is about to be ravished by the bully and that will fall in love instead with the darkly handsome Sharpe.
It's easier to remember Sharpe's Escape by focusing instead on the actual military campaigns described here, done with the usual Cornwell professionalism and overt admiration for the exploits of the redcoats in general, and for general Wellington in particular. The battle of Bussaco is part of the 1810 campaign when the British and their Portuguese allies tried to stop the army of Marechal Massena from marching on Lisbon. After a brief introductory episode establishing Sharpe's adversary for this installment and a subplot of destroying all food reserves in the countryside before the French advance, the Bussaco battle starts in earnest with clear exposition of the terrain, the troops, the weaponry and the tactics deployed by both sides. It reads at tmies like one of those Discovery Channels episodes about WWII or Vietnam, the result of really good research. Despite a strong bias against the 'Crapauds' and an attempt at whitewashing a grave mistake of Wellington who let his strong defensive position be sidelined in a flanking maneuver, the action scenes are some of the best I have read so far in the series.
After Bussaco, the novel concentrates on the secondary plot about food and the personal duel between Sharpe and the bully, as they both get caught behind enemy lines in Coimbra, a beautiful university town about to be pillaged by the dastardly French. After a spirited chase across the countryside, the novel closes with a bonus battle (more like a skirmish, but really well developed), this time in front of the fortified defensive positions cutting off access to Lisbon.
Character development is less impressive, mostly due to the non-chronological way the novels were written, with the author starting off late in the timeline and then going back and filling in the gaps in Sharpe's biography. The result has the advantage of making it possible to read any story as a stand-alone, but is often repetitive when it comes to re-establishing the hero's personality. My principal grumble is with the adversaries and the love interests, who are usually clones of previous characters with only the names and hair colour changed. To be fair, in this episode there is an interesting personal touch, delving on the continued insecurity Sharpe feels towards career officers who can buy their comission and who stick together for one another like members of an exclusive club, a club from which Sharpe feels excluded by his lack of money, education and family connections.
Bottom line : better than the previous two books, and a must for fans of the series.