The Droid Army of HK-01 was a group of fighters put together by the renegade HK-series assassin droid unit known as HK-01; its purpose was to stand against organic beings with intelligence.
In 4015 BBY, HK-01 and his forces initiated what became known as the Great Droid Revolution, battling against the Galactic Republic and the organic population they deemed "superior". The conclusion for HK and his army arrived when Arca Jeth, a Jedi Master, employed a novel Force ability to bring their aggressive rampage to a halt.