Strong’s Greek
G4961 — sustratiotes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
συστρατιώτης
sustratiotes — pronounced soos-trat-ee-o'-tace
from 4862 and 4757; a co-campaigner, i.e. (figuratively) an associate in Christian toil:--fellowsoldier. see GREEK for 4862 see GREEK for 4757
2 occurrences in the KJV.
Philippians 2:25
Yet I supposed it necessary to send to you Epaphroditus, my brother, and companion in labour, and fellowsoldier, but your messenger, and he that ministered to my wants.
Philemon 1:2
And to our beloved Apphia, and Archippus our fellowsoldier, and to the church in thy house: