There's an interesting chapter in the book where a veteran of World War Z reflects about the US military's first large-scale battle with an undead horde. Despite automatic weapons, tanks, air support, and last-ditch-thermobaric-weapons-of-doom they are overrun by the living dead. The outcome is due to a combination of insufficient understanding of the undead, poor command and control, and the incorrect adaptation of doctrine and weapons to effectively combat the zombies. Whilst the work is, of course, fictional, the defeat of a modern military force by a poorly understood and underrated unconventional enemy is one that has a ring of truth about it, not to mention a number of historical parallels.
The above is, obviously, perhaps a touch too serious given we're referring to an entirely made-up scenario. But, long story short, do pick up a copy of 'World War Z' if you can because it's actually a well thought-out, well executed, hoofing read.