The reforms, especially the decentralization of administrative authority, were not received well by the Soviets, who, after failed negotiations, sent half a million Warsaw Pact troops and tanks to occupy the country. A large wave of emigration swept the nation. A spirited non-violent resistance was mounted throughout the country, involving attempted fraternization, painting over and turning street signs (on one occasion an entire invasion force from Poland was routed back out of the country after a day's wandering), defiance of various curfews, etc. While the Soviet military had predicted that it would take four days to subdue the country the resistance held out for eight months, and was only circumvented by diplomatic stratagems. There were sporadic acts of violence and several suicides by self-immolation (such as that of Jan Palach), but there was no military resistance. Czechoslovakia remained controlled until 1989, when the velvet revolution ended pro-Soviet rule peacefully, undoubtedly drawing upon the successes of the non-violent resistance twenty years earlier. The resistance also became an iconic example of civilian-based defense, which, along with unarmed civilian peacekeeping constitute the two ways that nonviolence can be and occasionally has been applied directly to military or paramilitary threats.

This happened in my lifetime.