The enemy ceased firing, and that stern, threatening, inaccessible, and intangible line which separates two hostile armies was all the more clearly felt.
All was destroyed, except something intangible yet powerful and indestructible.
…experience he knew, and with the wisdom of age understood, that it is impossible for one man to direct hundreds of thousands of others struggling with death, and he knew that the result of a battle is decided not by the orders of a commander in chief, nor the place where the troops are stationed, nor by the number of cannon or of slaughtered men, but by that intangible force called the spirit of the army, and he watched this force and guided it in as far as that was in his power.
But when we watch the ants round their ruined heap, the tenacity, energy, and immense number of the delving insects prove that despite the destruction of the heap, something indestructible, which though intangible is the real strength of the colony, still exists; and similarly, though in Moscow in the month of October there was no government and no churches, shrines, riches, or houses—it was still the Moscow it had been in August.
There are no more uses of "intangible" in the book.