one-man army

one-man army (uncountable)

1. A single person who performs a task typically performed by a group.

   Near-synonym: one-man band

   • 1978, A. S. Newman, United States Army Combat Forces Journal‎, volume 28, Association of the United States Army, page 68:

     By this time in my military life cycle it had become clear I was neither a One-Man Army or Superman.

   • 2020, Harvey Meyerson, Beth L. Bailey, Nature's Army: When Soldiers Fought for Yosemite‎, University Press of Kansas, →ISBN, page 31:

     During the past two decades, he's become a one-man army for drawing inspiring lessons from the cavalry's role in Yosemite and taking them to a global public—not only by telling the army story but also, even more impressively, by making that story his own.

   • 2023, Malini Ranganathan, David L. Pike, Sapana Doshi, Corruption Plots‎, Cornell University Press, →ISBN, page 68:

     Adept at legal lexicon and local government policies, and wielding the weapon of the RTI Act, the self-designated one-man army claims to be able to single- handedly hold the state and developers to account, fighting their collusive abuses.