allow it.

And, a little farther on, he reads there:

Profound study of the history of war will make the officer
guard against exaggerated humanitarian concessions, will
teach him that war can not take place without certain
harshness, _that true humanity consists in proceeding
without tenderness_.

Farther along in that book, he reads:

All the methods invented by the technic of modern warfare,
the most perfected as well as the most dangerous, _those
which kill the greatest number at once, are permitted_.
These last are conducive to the quickest end of the war;
they are, if you consider matters carefully, the most humane
methods.... Prisoners may be killed in case of necessity if
there is no other means of guarding them properly.... The
presence of women, children, old men, the sick and the
wounded in a beseiged city can hasten the place's fall; in
consequence it would be very foolish of the beseiger to
renounce this advantage.... They will force the inhabitants
to furnish information concerning their army, military
resources and secrets of their country. The majority of
writers in all nations condemn this usage. _It will be used
none the less_--very regretfully--for military reasons.

Finally, on the volume's last page, is found this extraordinary maxim: