Zombies will try to scale any surface no matter how unfeasable or even impossible. In all but the easiest situations, these attempts have met with failure. Even in the case of ladders, when simple hand-over-hand coordination is required, only one in four zombies will succeed.
Max Brooks[...]you donโt have to be Sun freakin Tzu to know that real fighting isnโt about killing or even hurting the other guy, itโs about scaring him enough to call it a day.
Max BrooksOf all the weapons discussed in this book, nothing is more important than your primary firearm. Keep it cleaned, keep it oiled, keep it loaded, keep it close. With a cool head, steady hand, and plenty of ammunition, one human is more than a match for an army of zombies.
Max Brooks