The problem in defense is how far you can go without destroying from within what you are trying to defend from without.
“Not houses finely roofed or the stones of walls well builded, nay nor canals and dockyards make the city, but men able to use their opportunity.”
“People are always the start for me... animals, when I can get into their heads, gods, supernatural beings, immortals, the dead... these are all people to me.”