 He called Field Marshal Wilhelm Keitel, the Chief of "Oberkommando der Wehrmacht" (OKW, "high command of the armed forces"), in Fürstenberg.Krebs told Keitel that, if relief did not arrive within 48 hours, all would be lost.Keitel promised to exert the utmost pressure on Generals Walther Wenck, commander of XII Army, and Theodor Busse, commander of the IX Army.