20th Century
These were used in both World Wars by both Germany and the United Kingdom. Whilst the British used armed passenger liners defensively for protecting their shipping, the German approach was to use them offensively to attack enemy shipping.
Read more about this topic: Armed Merchantman
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“Invite your friend to a feast, but leave your enemy alone; and especially invite the one who lives near you.”
—Hesiod (c. 8th century B.C.)