You know, the truth of the matter is that most of those people owe their lives to those maggots.
Maggots don't eat fresh, viable living tissue-just the rotted meat. So, basically, the maggots are/were keeping the wounds clean and free of infection.
"Sterile" maggots are still used in wound care in medical practices today.
They do a better job of debridement than the doctors or nurses can do.