The Romans taught this lesson to the Carthaginians in the Third Punic War (http://en.wikipedia.org/wiki/Third_Punic_War#The_course_of_war) when at one point they demanded all weapons and armor to be handed over. When the Carthaginians complied in an attempt to appease Rome, the Romans demanded that the Carthaginians move inland by at least ten miles and told them that Carthage was to be burned. The Carthaginians could not accept this but, now defenseless, could only endure a siege until their eventual and inevitable defeat.

The Romans may well have attacked and even defeated Carthage even if the Carthaginians hadn’t disarmed, but nonetheless this incident demonstrates that disarmament is not a “way to peace”.