In the context of World War II, the invasion of Belgium was just one of the events that signaled the eruption of active war on the Western Front in May of 1940. Following eight months of "phony war" from late 1939 to early 1940, German forces invaded the Netherlands, Luxembourg, and Belgium while on their way into France.
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1939- Poland and annexed Austria 1940- Holland and Belgium, France
Germany's invasion of Poland.
Officially, it was the German invasion of Belgium. Britain and Belgium had been allies for around 70 years when the war began. Additionally, since France and Germany had been enemies in the past, their border was heavily fortified on both sides, but Belgium's borders were not as heavily fortified. When the war began, Germany asked Belgium for permission to go through their territory; Belgium said no. So Germany did it anyway and conquered Belgium. When Germany launched their invasion, Britain honored their old alliance with Belgium and officially declared war.
Operation Overlord, the invasion of Normandy, began on June 6th, 1944.
Technically it would be Austria March of 1938.