Diplomacy

World War II in Europe began on September 1, 1939, with Germany's invasion of Poland, and two days later Britain and France declared war on Germany, so it was a surprise when representatives of the two western powers showed up at a special commission session in neutral Romania in February 1940; the British and French representatives were greeted with "hearty handshakes" by the German delegate, whose turn it was to preside. "Although the conference was behind closed doors," the New York Times reported, "it was believed that the principal subject of discussion was liquidation of the commission."^{[1]: 42 [5]: 4}

In August 1940, the Reich unilaterally announced the dissolution of the European Commission, noting that Germany and Italy had withdrawn and Britain and France were nonfunctioning members. "German quarters noted with satisfaction that this ends the existence of a valuable source of information for the Allies on the economic situation in Danubian territory," reported the New York Times.^[6]: 4

Meanwhile, the upstream International Danube Commission was undergoing similar Nazi-imposed changes. The Reich had pulled out of the commission in November 1936, with an announcement that it was assuming "full sovereignty" over all German watercourses. After the Anschluss in 1938, Austria's membership also came to a close.^[7]: 19 Early in 1940, German sources were quoted in the Times that Germany was attempting "through innuendo and informal suggestions"^[8]: 3 to take over control of the river, and late that year a conference was held in Vienna (then part of the German Reich) to dissolve the upriver commission. A new group, "The Consultative Commission for Danubian Affairs Above Brăila" was instituted, chaired by Germany, the only nation that had the power to call meetings.^[9]: 6 Other members were Italy, Hungary, Bulgaria, Slovakia, and Yugoslavia, which nation was later excluded when relations with Germany became strained.^[10]: 3

The Soviet Union protested the abolition of the downriver European Commission, noting that it possessed territory on the Danube, having annexed Bessarabia again early in 1940 and must be consulted on any move. Germany then resurrected the European Commission and allowed the USSR to become a member, allotting to it "Britain's former authority."^[11]: 3 This commission began its meeting in October 1940, with the Soviets bringing a plan that would make a reality of "its dream of a port for ocean-going vessels" on the Danube's Chilia branch.^[12]: 3 The meetings, however, degenerated into political squabbling, with the Soviets walking out midway through the series.^[1]: 44 The commission ended in December, and "diplomatic sources" told the Times that :

the Italian and Russian delegates had engaged in fist fights when the conference broke up. The Russians objected to Italian participation, contending that the Fascisti had no interest in the Danube, but Premier Mussolini's representatives announced that the Rome government had purchased two small tugboats to fly Italian flags on the Danube.^[12]: 3

Modern map of the Danube.
The Chilia branch is the top line in the Delta (right), and the Sulina channel is the middle one.

London quickly protested to Moscow about Soviet participation in the conference, but the Soviet foreign ministry replied that Britain was no longer relevant to the Danube as far as it was concerned. The note said:

The formation of the Danube Commission with the participation of the U.S.S.R. and also of States situated on the Danube or near the Danube constitutes a restoration of justice violated by the Versailles and other treaties, on the strength of which the British Government, having played a leading part in this matter, the U.S.S.R. was kept out of the international as well as the European Danube Commission.

The Danube Commission must naturally be composed of representatives of States situated on or closely connected with the Danube and using the Danube as a trade channel (for instance, Italy).

It is clear that Great Britain, being removed thousands of kilometers from the Danube, cannot be classed as such a State.^[12]: 3

Romania entered World War II on November 23, 1940, by signing the Tripartite Pact of the Axis powers. Bulgaria signed on January 3, 1941, and German troops entered the country the next month.^[13]

Nazi aims

Nazi Germany's main concerns in establishing control over the Danubian basin were mostly economic in nature.^[14] Adolf Hitler's primary objective throughout the war was to conquer sufficient "living space" (Lebensraum) at the expense of the Soviet Union and other countries in Eastern Europe for German settlement, which would in turn allow control over the country's rich deposits of natural resources (such as oil, grain, and iron), transforming Germany into an economic autarky.^[14] The Danube was considered to be the main route along which this stream of raw materials was to be transported to Germany proper.^[14] Hitler referred to the Danube as the "river of the future".^[15] At other times he was more explicit about its role in the German-dominated Europe:

"The Danube is the waterway which leads into the very heart of the continent, and for this reason, in a Europe united by us, will have to be regarded as a German river and controlled by Germany."

— Adolf Hitler, 29 June 1942.^[16]

In view of these intentions, various proposals to establish permanent German possession of the entire Danubian waterway were formulated by the Nazis. One of these proposed the settlement of all the ethnic Germans in Southeastern Europe along a broad strip of territory on both sides of the river, stretching from Mohács in southern Hungary all the way to the Black Sea.^[14] Another suggested turning Belgrade into a fortress-city of the Reich (Reichsfestung) and the center of a Reichsgau (administrative subdivision), to be named Prinz-Eugen. Neither of these ideas was officially endorsed by the wartime German government, however, and the historical record indicates that the Nazis had no clear conception as to what extent Germany should control the Danube or how this control was to be effected.^[14] Hitler's own preference, at least for the immediate future, was the retention of a number of satellite states (Hungary, Romania, Bulgaria, and others) closely tied to the Nazi regime politically and economically. Serbia at the very least was most likely to remain under some permanent form of German administration.^[14]