Wiktionary
en mass
adv. (misspelling of en masse English)
Wikipedia
En mass
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Usage examples of "en mass".
Auburn would be remembering what his ancestors did to the Civil Government prisoners from the last expedition, blinded and castrated en mass.
A lump of roots pulled out of the crack en mass, from beneath the ground, and flowed over to smother the wound with dirty bandages.
He was a combat-technician undertaking alone a task which troops had once performed en mass.