PAULUS: From personal observation, I can say the following regarding this:
About September 1940, just at the time when I had received this operational study for the attack on the Soviet Union there was planned from the outset the use of Romanian territory for the deployment of the German right or, that is to say, south wing, and that was taken into consideration from the outset. A military mission headed by the then Lieutenant General of Cavalry, Hansen, was sent to Romania. A whole panzer division, the 13th, was transferred to Romania as a training unit. To those who knew about the plans for the future it was obvious that this step could only serve the purpose of preparing the future partner in the war for the task intended for him.
Further, in regard to Hungary:
In December 1940 Colonel Lazslo, the chief of the operational group of the Hungarian General Staff, came to the headquarters of the Army High Command at Zossen. He asked for a conference regarding questions of organization. The Hungarian Army at that time was concerned with the question of regrouping its units, which were organized in brigades, into divisions and also with the setting up of motorized troops and of panzer units. The chief of the Organization Division of the General Staff of the Army, then Major General Buhle, and myself advised Colonel Lazslo. At the same time, several Hungarian military commissions were in Berlin, and with them also the Hungarian Minister of War, General Von Bartha, and they discussed armament deliveries to Hungary with German authorities.
It was clear to all of us who were informed as to future plans that all these measures, including the supplying of arms to other armies, were only conceivable at that time if these weapons were to be employed in future military projects.
Regarding Hungary there is a further point:
Due to the development of events in Yugoslavia, Hitler, at the end of March 1941, decided to attack Yugoslavia. On 27 or 28 March I was called to the Reich Chancellery in Berlin, where there had just been a conference between Hitler, Keitel, and Jodl, in which the Commander-in-Chief and the Chief of Staff of the Army had participated, that is, had been ordered to be present.
When I arrived I was advised by the Chief of Staff of the Army, General Halder, that Hitler had decided to attack Yugoslavia in the first place to eliminate a threat to the flank of the intended operation against Greece, and get hold of the rail line going from Belgrade southward through Nish, and then also with an eye to the future—to Plan Barbarossa—to keep the right flank free from the outset.
I was instructed to go to Vienna, taking with me a number of competent General Staff officers of the Army, to deliver and explain pertinent orders to German commanders, and then to travel on without fail to the Hungarian General Staff in Budapest and to reach an understanding with it on the deployment of German troops on Hungarian territory and the participation of Hungarian troops in the attack on Yugoslavia.
On 30 March, early in the morning, I arrived in Budapest and had a conference with the Chief of the Hungarian General Staff, General Werth, of the infantry and then with the chief of the operational group of the Hungarian General Staff, Colonel Lazslo. These conferences went along in good order and ended very quickly, and the desired result was achieved. This result was then put down on maps. The map that I received from the Hungarian General Staff contained not only the deployment of the troops intended for the attack against Yugoslavia, but also forces on the Carpatho-Ukrainian border, which were to be placed there to protect our rear against the Soviet Union.