Crassus, one of the richest men in Roman history, had little battlefield experience. He needed victories, rather than money, to assure he could contest Julius Caesar and Pompey for the rule of Rome. His invasion of Parthia ended in disaster, and he was killed.

The Romans never fought against the Mongols or the Zulu.

While the Romans did fight many battles against the Greeks and Carthaginians, Crassus wasn't involved, and certainly didn't die in any of them.

The Warring States Period (475 - 221 B.C.E.) was an era of Chinese history known for constant civil war and conflict between various Chinese kingdoms. It ended in 221 B.C.E. with the victory of the Qin and the establishment of the brief, but important, Qin Dynasty under Qin Shi Huangdi. 

Herodotus is one of the earliest and most famous western historians. He lived in the fifth century B.C.E. and wrote extensively on the wars between Persia and Greece.

After an appeal by Segesta for help against Syracuse, Athenian sent an military expedition to Sicily. Although the expedition had some initial successes, it quickly unraveled and became one of Athens' worst defeats of the Peloponnesian War. The expedition became stranded on the island and eventually was entirely lost to Athens.

After the Syracusans slow start, Sparta sent Gylippus to the city, kickstarting the war effort.  While Lysander headed the conflict in Greece, Gylippus completely took over Syracuse's war effort and turned the tide of the conflict. Athens' failure to take the city was a disastrous defeat that changed the course of the war.

Lysander won the Battle of Aegospotami, forcing the Athenians to finally admit defeat. Lysander was the admiral of the Spartan fleet, built up over the course of the Peloponnesian conflict, eventually overwhelmed the traditionally stronger Athenian navy. While other Spartans, such as Brasidas and Gylippus, were pivotal to the Spartan war effort, it was Lysander who broke the Athenians.

During a war between Megara and Corinth, Athens forged an alliance with Megara, which was formerly a Spartan ally. This caused Sparta to enter on the Corinthian side, officially starting the Peloponnesian War. Aegina, Lesbos and Samos were other Greek powers that participated in the conflict.

The Athenian defeat resulted in the end of Argos and its Argive League, giving Sparta a renewed control over the Peloponnese. Argos had been one of Athens' most powerful allies, and arguably the second-most powerful city on the Peloponnesian Peninsula. Its defeat was a major blow to the Delian League and the Athenian war effort.

The Peloponnesian League was formed by Sparta in order to combat what they felt was a growing Athenian threat (Athens had formed the Delian League). The league played an important part in the Peloponnesian War. After the Peloponnesian War, the Spartans broke the power of the Delian League and The Peloponnesian League became the preeminent power in Greece.

The reign of the Western Zhou, when the Zhou Dynasty controlled almost all of what was then China, ended following a barbarian invasion that forced the Zhou government to flee eastwards. The newly formed Eastern Zhou was much weaker than the Western Zhou and, although it would endure for several more centuries, the Eastern Zhou never reclaimed its earlier authority.