Invasion

Invasion is a military action that directly threatens the autonomy of a nation or teritory. Invasion is often opposed by native resistance.

Invasions may also be conducted to change the leadership of a nation of territory. This sort of invasion may be perceived by one side as an act of usurpation, while the other may perceive it as an act of liberation.

List of invasions in Wikipedia:

2003 invasion of Iraq
2001 invasion of Afghanistan by the United States and allies
1990 invasion of Kuwait by Iraq
1983 invasion of Grenada by the United States and allied Caribbean nations
1981 invasion of Afghanistan by the Soviet Union
1961 failed invasion of Cuba by Cuban allies of the United States, particularly its CIA
1944 invasion of Normandy, France by the United States and Great Britain during World War II, also known as Operation Overlord
1943 invasion of Italy by the United States and Great Britain during World War II
1942 invasion of North Africa by the United States and Great Britain during World War II, also known as Operation Torch
1941 invasion of the Soviet Union by Nazi-ruled Germany during World War II, also known as Operation Barbarossa
1939 invasion of Poland by Nazi-ruled Germany and the Soviet Union, initiating World War II in Europe
1931 invasion of Manchuria by Imperial Japan
1812-1814 invasions of Canada by the United States as part of the War of 1812
1775 invasion of Canada by American partisans as part of the Revolutionary War
1592-1598 invasion of Korea by Japan
1223 invasion of Russia by the Mongols
1066 invasion of England by Norwegian and Norman forces. This is usually referred to as the Norman Invasion as it was won by the Normans.
1019 invasion of Kyushu, Japan by Jurchen pirates
642-711 invasion of Algeria by the Arabs as part of the Islamic Expansion
55 BC - 43 AD invasion of Britain by the Roman Empire

If you know of an invasion not listed here, and there are many, please do not hesitate to edit this list!