Thermonuclear Domination was my first ever IBM-PC game (in fact it's the first program I wrote for Windows!) It is a freeware game of nuclear war that runs in a Window.
Players take turns in aiming and firing nuclear weapons using a simple angle/range system. Each side has missile silos, cities, factories and submarines to control. One hidden city houses the enemy headquarters, destroy this and the enemy will lose.
Thermonuclear Domination is simple and fun to play, and you get to destroy the world too.