I know of experience that they were terrible fighters, most difficult to convince of a beating.
A whirlwind year it was.

While Yunsan and the Lady Om at Keijo completed the disgrace of Chong Mong-ju, I proceeded to make a reputation for myself.

Of course it was really Hendrik Hamel at my back, but I was the fine figure-head that carried it off.

Through me Hamel taught our soldiers drill and tactics and taught the Red Heads strategy.

The fighting was grand, and though it took a year, the year's end saw peace on the northern border and no Red Heads but dead Red Heads on our side the Yalu.
I do not know if this invasion of the Red Heads is recorded in Western history, but if so it will give a clue to the date of the times of which I write.