Not enough Japanese devils to kill? 1.4 billion people volunteer for the Battle of Shanghai.

Parallel worlds, parallel worlds, parallel worlds—I'll say it three times because it's important.
Bian Yun traveled through time, and he discovered that he could not only travel through time—
Each time you return, the scale of the journey will double.
First time: Arrived alone, empty-handed.
Second mission: Two-person team, 2 cubic meters of supplies (medicine, sniper rifle, drone).
Third time: A four-person team, 4 cubic meters of equipment...
The tenth: A modernized reinforced battalion.
Twentieth: The entire carrier battle group can transcend time and space.