The elephants are believed to have come from the nearby Amsang wildlife sanctuary.
An Army official said the forest department was informed after officials of 14 Field Ammunition Depot at the cantonment spotted the elephant and her calf at the cantonment’s water tank.
The water tank was emptied to prevent the elephants from drowning.
The elephants walked out of the tank after the tank’s wall was broken down.
The entire rescue operation took seven hours, the official said.