On the nature of things (books 4 - 6)   

And blindly through the squadrons havoc wrought,
Shaking the frightful crests upon their heads,
Now here, now there. Nor could the horsemen calm
Their horses, panic-breasted at the roar,
And rein them round to front the foe. With spring
The infuriate she-lions would up-leap
Now here, now there; and whoso came apace
Against them, these they'd rend across the face;
And others unwitting from behind they'd tear
Down from their mounts, and twining round them, bring
Tumbling to earth, o'ermastered by the wound,
And with those powerful fangs and hooked claws
Fasten upon them. Bulls would toss their friends,
And trample under foot, and from beneath
Rip flanks and bellies of horses with their horns,
And with a threat'ning forehead jam the sod;
And boars would gore with stout tusks their allies,
Splashing in fury their own blood on spears
Splintered in their own bodies, and would fell
In rout and ruin infantry and horse.
For there the beasts-of-saddle tried to scape
The savage thrusts of tusk by shying off,
Or rearing up with hoofs a-paw in air.
In vain- since there thou mightest see them sink,
Their sinews severed, and with heavy fall
Bestrew the ground. And such of these as men
Supposed well-trained long ago at home,
Were in the thick of action seen to foam
In fury, from the wounds, the shrieks, the flight,
The panic, and the tumult; nor could men
Aught of their numbers rally. For each breed
And various of the wild beasts fled apart
Hither or thither, as often in wars to-day
Flee those Lucanian oxen, by the steel
Grievously mangled, after they have wrought
Upon their friends so many a dreadful doom.
(If 'twas, indeed, that thus they did at all:
But scarcely I'll believe that men could not
With mind foreknow and see, as sure to come,
Such foul and general disaster. This
We, then, may hold as true in the great All,
In divers worlds on divers plan create,-
Somewhere afar more likely than upon
One certain earth.) But men chose this to do
Less in the hope of conquering than to give
Their enemies a goodly cause of woe,
Even though thereby they perished themselves,
Since weak in numbers and since wanting arms.

Now, clothes of roughly interplaited strands
Were earlier than loom-wove coverings;
The loom-wove later than man's iron is,
Since iron is needful in the weaving art,
Nor by no other means can there be wrought
Such polished tools- the treadles, spindles, shuttles,
And sounding yarn-beams. And Nature forced the men,
Before the woman kind, to work the wool:
For all the male kind far excels in skill,
And cleverer is by much- until at last
The rugged farmer folk jeered at such tasks,
And so were eager soon to give them o'er
To women's hands, and in more hardy toil
To harden arms and hands.
But Nature herself,