This is a time of great powers: The vast Persia, Sparta that was founded by force, Athens with its trade and business, Thebes the rising star, The ambitious Macedonia, The twin heroes of the Western Mediterranean, The rising Rome and so on.

This is an era of brilliant stars: Agesilaus II – the last king of Sparta, Epaminondas – the Rising General of Thebes, Philip II – the founder of Macedonian’s hegemon, Dionysius – the tyrant of Syracuse, Camillus – the Roman dictator and savior…

This is an era of contention among a hundred schools of thought: Plato – the great philosopher, Antisthenes – founder of cynicism, Pythagoras – school of number, Democritus – the encyclopedia scholar, Hippocrates – the father of western medicine, Aristophanes – the great dramatist…

What will the hero bring to the world when he comes to this age as a humble mercenary through rebirth?

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What is modern warfare really like? Some say a $200 million drone launches a million-dollar missile and hits a $10,000 jeep.

Commanding a battle is also a science...

M4A1: Commander, your book... has nothing to do with commanding operations...

Chen Shusheng: As a commander, it is normal for me to use firearms, right?

M16: So what is this book on technical lock picking?

Chen Shusheng: There are no keys to the Iron Blood bases, so sometimes we have to find a way ourselves.

UMP45: Commander, your book "Homemade Simple Armor"... is it mocking me?

Chen Shusheng: How could that be?

HK416: Why did you give me this grenade tutorial?

SOP: Commander, this "Tea Eggs: From Beginner to Mastery" is so complicated. Does it take so long to boil a tea egg? Why did the United States take eight years?

Chen Shusheng: Be good, this is not the book you should read. You should read this one.

G36: Commander, what do you usually watch?

Chen Shusheng: I usually read this one.

Everyone looked at the "Guide to Using Collapse Liquid" in Chen Shusheng's hand and fell into deep thought.