PROIOXIS was the spirit (daimona) of onrush and battlefield pursuit. She and her sister Palioxis presided over the surge of battle. Proioxis was probably one of the Makhai, the spirits of battle.

She was perhaps identicial to Ioke.

Hesiod, Shield of Heracles 139 ff (trans. Evelyn-White) (Greek epic C8th or C7th B.C.) :
"In his hands he [Herakles] took his shield, all glittering: no one ever broke it with a blow or crushed it. And a wonder it was to see . . . In the centre was Phobos (Fear) worked in adamant, unspeakable, staring backwards with eyes that glowed with fire. His mouth was full of teeth in a white row, fearful and daunting, and upon his grim brow hovered frightful Eris (Battle-Strife) who arrays the throng of men : pitiless she, for she took away the mind and senses of poor wretches who made war against the son of Zeus . . . Upon the shield Proioxis (Onrush) and Palioxis (Backrush) were wrought, and Homados (Tumult), and Phobos (Panic), and Androktasia (Slaughter). Eris (Battle-Strife) also, and Kydoimos (Confusion) were hurrying about, and deadly Ker (Fate) was there holding one man newly wounded."

Sources:

• Hesiod, Shield of Herakles - Greek Epic C8th-7th B.C.