Abbott-Smith Manual Greek Lexicon
στρατεύω (G4754)
7 στρατεύω and depon., -ομαι , so always in NT ( στρατός , an encamped army ), [in LXX for מההּ hith., יצא , צבא ; metaph., IV Mac 9:23 ;] used of the general, to make war, do battle , and (chiefly) of the soldiers serving under him, to serve as a soldier : Lk 3:14 , I Co 9:7 , II Ti 2:4 . Metaph. (cf. MM, ii, xxiii), of spiritual conflict, to war, make war : II Co 10:3 , I Ti 1:18 , Ja 4:1 , I Pe 2:11 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain