Korean army lead by Yi Sun-shin (1545 – 1598), their Korean naval commander, during the Imjin war,
Yi never lost a battle and delivered one of the most astonishing defeats in military history at the Battle of Myeongnyang, with only 13 ships against 333 Japanese ships.
At the Battle of Noryang, his famous dying words were, "The battle is at its height...beat my war drums...do not announce my death."
and WoT, as you requested, here's my Korean army, slowly growing, perhaps in the ratio of 13:333 against my samurai army...