Despite the fact that there have been clear signs that they might soon invade South Korea, when the North actually does in force on June 25th, 1950, it comes as a complete shock to the world. But is this a full invasion, or just cross border raids such as there were in 1949? And is there something more behind this? Stalin's Soviets? Mao's Chinese? And how will the world react? Find out this week as our week by week coverage of the war begins!