Extended Strong's Greek Lexicon (Abbott-Smith based)
warfare
Usage: στρατεία (on the orthogr., see Deiss., BS, 181 f.), -ας, ἡ (οτρατεύω), [in LXX chiefly for צָבָא ;] an expedition, a campaign, warfare: metaphorically, 2Co.10:4 (-τιά, T), 1Ti.1:18.† (AS)