Defensive war
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A defensive war is one of the causes that justify war by the criteria of the Just War tradition. It means a war where one nation is mainly trying to defend itself from another, as opposed to a war where both sides are trying to invade and conquer each other.
[edit] Examples
The Darius' Invasions of the Greco-Persian Wars. Greeks were defending their homeland from the Persians. The war between the North and South in the American Civil War, 1861-1865. The South was largely fighting a war of defense, while the North was attacking to forcibly reunite the separated nation. Various invasions in World War II, such as the Invasion of Poland, the Battle of France, and the Battle of Britain and the Second Sino-Japanese War were wars of defense.

