Qi Jiguang
At the age of 22, Qi Jiguang headed for Beijing to take part in the martial imperial examination. During this time, Mongol troops led by Altan Khan broke through the northern defenses and laid siege to Beijing. Candidates participating in the martial arts exam were mobilized to defend the nine gates of the capital. Qi Jiguang twice submitted defense proposals to the emperor and was noted to have displayed extraordinary valor and military cunning during the battle, and saw the defeat of the invaders.