Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     Now, Memmius,
How nature of iron discovered was, thou mayst
Of thine own self divine. Man's ancient arms
Were hands, and nails and teeth, stones too and boughs-
Breakage of forest trees- and flame and fire,
As soon as known. Thereafter force of iron
And copper discovered was; and copper's use
Was known ere iron's, since more tractable
Its nature is and its abundance more.
With copper men to work the soil began,
With copper to rouse the hurly waves of war,
To straw the monstrous wounds, and seize away
Another's flocks and fields. For unto them,
Thus armed, all things naked of defence
Readily yielded. Then by slow degrees
The sword of iron succeeded, and the shape
Of brazen sickle into scorn was turned:
With iron to cleave the soil of earth they 'gan,
And the contentions of uncertain war
Were rendered equal.
     And, lo, man was wont
Armed to mount upon the ribs of horse
And guide him with the rein, and play about
With right hand free, oft times before he tried
Perils of war in yoked chariot;
And yoked pairs abreast came earlier
Than yokes of four, or scythed chariots
Whereinto clomb the men-at-arms. And next
The Punic folk did train the elephants-
Those curst Lucanian oxen, hideous,
The serpent-handed, with turrets on their bulks-
To dure the wounds of war and panic-strike
The mighty troops of Mars. Thus Discord sad
Begat the one Thing after other, to be
The terror of the nations under arms,
And day by day to horrors of old war
She added an increase.