Duffer's Drift Link --
It is over a hundred years old, but Ernest Swinton's short little work is still of value. For those unfamiliar with it, I urge you to take a few minutes and read through it. It not only has many uses as a tactical tool, but it contains more than a few ideas for miniature games.
Best of all, you don't need to go to a library to read it. It is available online -- here's the link:
Be sure to click on the "Map" to see what the terrain looked like.
For those who don't know of it, it purports to be a series of dreams where a young officer tries various ways of defending a vital piece of real estate during the Boer War (1899-1902). The tactical lessons he learns might just help us on the tabletop.
Give it a read . . . it isn't long.