The operation orders for the lightning war against Yugoslavia were drafted in great haste, and Undertaking Marita had to be modified to meet the new circumstances. Pressure was applied to Hungary to allow the passage of German troops and to take part itself in the invasion. On 2nd April the pathetic Hungarian Prime Minister, Count Teleki, finally did his country a favour by shooting himself, and the Hungarian Chief Of General Staff readily agreed to the German demand. Romanian and Bulgarian participation was also easily secured. Next day, in Directive No. 26, Hitler issued his plan of campaign.