Satyabhama was a warrior and assisted Krishna in battle against Naraka -
"Satya, the wife of the wielder of Sarnga, pierced Naraka with sharp
narachas, crescent-shaped arrows and with bhallas. Satya tormented
Naraka as the truth torments liars. Seeing her fighting thus, Narka
attacked her between her breasts with sharp arrows and shot between
her arms six fast-flying arrows and on her sides with seven arrows.
Satyabhama then became furious and with a very sharp arrow chopped the evil Naraka's bow into two. The powerful Satyabhama then chopped
into pieces his flag and flagpole too, as well as his umbrella, his
chariot and horses. The mighty Danava then picked up another
powerful bow and Satyabhama chopped that too into two, and when he
picked up bows one after the other, Satya broke them all into
pieces.Then the angry Danava picked up a mighty mace and hurled it
at her as Krishna watched. She saw the mace approaching and broke it
into smithereens. Then Naraka picked up a sakti and began to attack
her with it. The devi, Krishna's dear wife Satyabhama, then broke that
too into smithereens and laughed aloud. Then picking up a parigha,
Naraka then attacked her by hurling it at her. Satya in reply attacked
the Danava with sharp arrows and pierced his body with them. Krishna
then praised his dear wife Satyabhama pleasing her, as did the Gods
and holy sages, all standing in the skies. Devi Satyabhama, Lord
Krishna's Shakti, then with an arrow separated the head of Naraka's
charioteer from his body. Krishna, the Glorious One, then became
delighted and hugged her and wiped off the perspiration on her born of
battle strain."
- Appendix 28 A, Harivamsa, Mahabharata, BORI.