serve in a military campaign

used of the general, , and (chiefly) of the soldiers serving under him, : , , . Metaph. (cf. MM, ii, xxiii), of spiritual conflict, : , , , .† to make war, do battle to serve as a soldier to war, make war Lk 3:14 I Co 9:7 II Ti 2:4 II Co 10:3 I Ti 1:18 Ja 4:1 I Pe 2:11

to serve in a military campaign; figuratively, to execute the apostolate (with its arduous duties and functions), to contend with carnal inclinations

soldier, (go to) war(-fare)