or you if you captured the second strongest city of the far east then it will be easy for you because the soldiers of that city also have that one hit knockout move
if you want to win the capital cities of the far east you can either be one of them and use their special attack or just enchant a weapon with "ignores defence" rune and attack
Dude! You just completed the Ending the War to End All Wars achievement in Warfare: 1917 and won the Ending the War to End All Wars badge and 15 points!