To be honest, if those 70+ lords couldn't teleport 3,000 troops each (210,000 total). The song family wouldn't have lost the city within a couple of hours. They had scouts. So how could a 100,000 army suddenly appear outside the city's walls. Technically, in that sense. All of china's lords could send 3,000 troops to any location and amass a million plus army outside the enemies terriroty. Logically, that shouldn't be possible to move a million people at the speed of light.
SaltSovereign