German invasion of Belgium

Definition and stakes

The Story of the Great War, Volume 1

The German Government cannot but fear that Belgium, in spite of the utmost good will, will be unable, without assistance, to repel so considerable a French invasion with sufficient prospect of success to afford an adequate guaranty against danger to Germany. It is essential for the self-defense of Germany that she should anticipate any such hostile attack. The German Government would, however, feel the deepest regret if Belgium regarded as an act of hostility against herself the fact that the measures of Germany's opponents force Germany, for her own protection, to enter Belgian territory.
Source: Gutenberg

baron Beyens Germany before the war

The invasion of Belgium was a blunder, both political and military. Political, because England—who no doubt would inevitably have come to take her stand by France, but not at the very opening of hostilities—was moved forthwith to intervene; military, because the heroic and unexpected resistance of the Belgian army frustrated the rapid march on Paris—in other words, wrecked the initial plan of the German Staff.
The Imperial Government did not anticipate that we should show fight. Our hearts would fail us, they thought, at the mere approach of that redoubtable monster, the gigantic German army.
Source: Gutenberg

United States. Office of Chief of Counsel for the Prosecution of Axis Criminality Nazi Conspiracy and Aggression…

The German Government considers that the inviolability and integrity of Belgium are common interests of the Western Powers. It confirms its determination that in no circumstances will it impair this inviolability and integrity and that it will at all times respect Belgian territory except, of course, in the event of Belgium’s taking part in a military action directed against Germany in an armed conflict in which Germany is involved. The German Government, like the British and French Governments, is prepared to assist Belgium should she be subjected to an attack or to invasion.
Source: Gutenberg

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