"were left unharmed" is a correct and usable phrase in written English.
You can use it to indicate that something or someone has been spared any harm or injury. For example, "The children were left unharmed after the fire was put out."
In Tulsa, rookies might have pumped up the balls, but our own were left unharmed.
The soldiers of the Swiss Salis-Samade Regiment, however, were not wearing their uniform coats and were mistaken for Bastille prisoners; they were left unharmed by the crowds until they were escorted away by French Guards and other regular soldiers among the attackers.
Furthermore, immunoblotting showed that lamins and most NPC-core proteins were left unharmed (Supplementary Figure S3).
Somehow, the children were left unharmed and are now in the care of Pastor Abraham Korok.
Hunting the wren or "wrenning" survived longest in southern Ireland, but its modern legacy is a more humane charitable event in which birds are left unharmed.
They made off with about $1,000, but the gas station attendant was left unharmed.
He was killed by his own bomb but the computer was left unharmed.
At their most toothless they asked if Taylor Swift was behind it, while the vilest comments asked why she had been left unharmed.
The fetus (which, to be clear, is left unharmed to become a real, live human being) is printed with clear filament so we can all see the semi-formed baby inside, printed in ghostly white.
Clownfishes are left unharmed by the otherwise lethal nematocysts of the sea anemone tentacles.
The focal nature of the energy delivery in proton beam therapy could in theory mean that untargeted areas are left unharmed [ 67].
