List of invasions  This is a list of invasions ordered by date. An invasion is a military offensive in which sizable number of combatants of one geopolitical entity aggressively enter territory controlled by another such entity, generally with the objectives of establishing or re-establishing control, retaliation for real or perceived actions, liberation of previously lost territory, forcing the partition of a country, gaining concessions or access to natural resources or strategic positions, effecting a change in the ruling government, or any combination thereof. "See also": World War I timeline  "See also": French Revolutionary Wars, Napoleonic Wars           431–404 BC multiple invasions of Athens and allies by Sparta and allies; multiple invasions of Spartan allies by Athens and allies