The Trojan war was fought between the Trojans and the Achaeans after the abduction of Helen, the wife of King of Sparta by Paris of Troy.
A main contrast or difference between the two - While the Trojans are said to fight the war in order to protect their families, the Achaeans were fighting in the name of honor, without fearing death, trying to save the woman (Helen, their Queen), meanwhile, hundreds of innocent Trojans have been killed in this war. Achilles, the greatest Achaean hero had caused mayhem on Trojans, where Trojans are often portrayed as scared and helpless against his assault.
Achaeans can be best described as silent yet ruthless warmongers (they kept the war running for 10 years, and finally won it by defeating the Trojans using the Trojan horse).
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