Instructions for the attack on the Netherlands, Belgium, Luxembourg, and northern France.

BELGIUM—THE OFFICIAL ACCOUNT OF WHAT HAPPENED 1939-1940, pages 27-29.
From two o'clock in the morning, the Dutch wireless stations announced, time after time, that aeroplanes going from East to West were flying over various localities in the Netherlands. It was impossible to ascertain the importance and significance of this information, but all the signs pointed in the same direction. The Government decided there and then to introduce a state of siege and to arrest suspected persons in the Eastern provinces so as to prevent internal action against our lines of defense.
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As the night wore on, there was a fairly long lull. When dawn was about to break, the peace of the capital had not been disturbed.
From 4.30 information was received which left no shadow of doubt: the hour had struck. Aircraft were first reported in the east. At five o'clock came news of the bombing of two Netherlands aerodromes, the violation of the Belgian frontier, the landing of German soldiers at the Eben-Emael Fort, the bombing of the Jemelle station. 1
While the Minister of National Defense was checking this information, Brussels was suddenly awakened to a radiant dawn at 5.17 a. m. by the mournful sound of the sirens, and soon the windows of the Ministry of Foreign Affairs, where the chief members of the Government were still assembled, were shaken by the firing of'antiaircraft artillery and German bombs dropped on the Evere aerodrome and on several parts of the town.
It was at once decided to appeal to Belgium's guarantors, and this was done.
At 8.30 the German Ambassador came to the Ministry of Foreign Affairs. When he entered the Minister's room, he began to take a paper from his pocket., M. Spaak stopped him: "I beg your pardon, Mr. Ambassador. I will speak first." And in an indignant voice, he read the Belgian Government's protest: "Mr. Ambassador, the German Army has just attacked our country. This is the second time in twenty-five years that Germany has committed a criminal aggression against a neutral and loyal Belgium. What has just happened is perhaps even more odious than the aggression of 1914. No ultimatum, no note, no protest of any kind has ever been placed before the Belgian Government. It is through the attack itself that Belgium has learned that Germany has violated the undertakings given by her on October 13th, 1937, and renewed spontaneously at the beginning of the war. The act of aggression committed by Germany, for which there is no justification whatever, will deeply shock the conscience of the world. The German Reich will be held responsible by history. Belgium is resolved to defend herself. Her cause, which is the cause of Right, cannot be vanquished."
The Ambassador was then able to read the note he had brought: "I am instructed by the Government of the Reich," he said, "to make the following declaration: In order to forestall the invasion of Belgium, Holland, and Luxemburg, for which Great Britain and France have been making preparations clearly aimed at Germany, the Government of the Reich is compelled to ensure the neutrality of the three countries mentioned by means of arms.
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For this purpose, the Government of the Reich will bring up an armed force of the greatest size, so that resistance of any kind will be useless. The Government of the Reich guarantees Belgium's European and colonial territory, as well as her dynasty, on condition that no resistance is offered. Should there be any resistance, Belgium will risk the destruction of her country and the loss of her independence. It is therefore in the interests of Belgium that the population be called upon to cease all resistance and that the authorities be given the necessary instructions to make contact with the German Military Command."
In the middle of this communication, M. Spaak, who had by his side the Secretary-General of the Department, interrupted the Ambassador: "Hand me the document," he said. "I should like to spare you so painful a task." After studying the note, M. Spaak confined himself to pointing out that he had already replied by the protest he had just made.