In May of 2033, war broke out between China and India over their disputed border. A peacekeeping force was organized of UN troops from several different countries, including the US, Russia, the EU and Japan.
A truce was declared. The Peacekeepers came in and set up three base camps in the high mesas and mountainsides. A few months passed with no major incidents.
Then, one Monday evening in October, with icy rain falling, an artillery duel developed between entrenched units on both sides. The Nineteen Minute War, a nuclear exchange, began at 11:41 p.m. local time.
Tuesday never came.