zhè zhǒng / sī lüè / xíng wéi / zài / dāng shí / bèi / shì wéi / hé fǎ / de / zhàn zhēng / shǒu duàn

这种私掠行为在当时被视为合法的战争手段。

Such privateering acts were considered legal means of warfare at the time.