It seems unsurprising now that at some point in the 19th Century the colloquial term sawbones came into use to describe surgeons. It's perhaps only surprising that the term seems to have originated after the Napoleonic wars, as it quite literally describes one of the most common medical battlefield operations of that bloody era.
Although Larrey's memoirs include material on his pre-Bonaparte adventures, Richardson, having given a sketch of his background and early career, only really starts to get properly stuck in with the expedition to Egypt. From thereon in Larrey marches with the Guard, almost always near his emperors' side, through many campaigns, right up to Waterloo.
An English translation of Larrey's memories can be read here
 Abraham Lincoln.
 It's interesting that the Larrey on the stamp is the younger, fitter man, whilst the Larrey on the chocolate box, undoubted benefactor of mankind that he was, is the later more corpulent Larrey!
 The scenario was complex and tortured: Larrey's pay was significantly in arrears, and it appears that those with power in the administration decided that billing Larrey for the losses in military medical equipment that occurred in Russia, during the ill-fated 1812 campaign, would allow them not only to save on paying him, but to get money from him. Bloody typical pen-pushing, money-grubbing bureaucrats. Leeches!