I might add that the claim–“95% of the patients were under some form of anesthesia”–is meaningless. This same site indicated that anesthesia sometimes meant whiskey or morphine. Imagine getting one or two shots of whiskey, then having someone saw off your bloody leg mid-thigh.
Also, it seems to me that whiskey, ether or chloroform would do nothing for the considerable post-surgical pain–which might persist for days, weeks, or months. As I recall, untold thousands of narcotics addicts (morphine) got their sad start from U.S. civil war injuries and medical care, but this fact was hushed up by successive by shamed administrations, the media, public, etc.
Remember too: since germ theory was non-existent, the surgeons would saw off limb after limb with the same saw, perhaps wiping off the saw blade (as best as one can) with a bloody rag in between “operations.”
A last point: scholars and institutions sometimes have biases and agenda, and seek to bolster viewpoints that serve their causes, while ignoring important evidence to the contrary. IIRC, I got the opening site from the National Museum of Civil War Medicine.
They shattered bones back then, too. That was the main reason for amputations: While the surgeons were ill-equipped to deal with penetrating wounds in general, they were totally unable to deal with a complicated procedure like repairing a shattered bone, which today requires a sterile operating theater and any number of pins and wires. They knew the boys stood a better chance of living if a shatter-boned limb just came off.