On the drill ground, as various colored flags waved and swung, the soldiers quickly adjusted their formation in response to the commands signaled by the flags, changing movements according to the Blood Turning Massacre Formation in Li Ming's mind.
As the flags waved, the soldiers gradually became familiar with the specifics of the formation, and eventually, they grew more adept and faster, eventually needing no flag signals to rapidly form battle arrays on their own.
And all this was achieved in just one day.
In ancient times, there were special methods for proper training.