As head of the OKH, Guderian was faced with the pressing issues of the staff work being impacted by arrests, which among the OKH staff and their families eventually ran into the hundreds. Guderian had to fill serious gaps, such as one created by the suicide of General Eduard Wagner, the quartermaster general, in July. Even with vacancies filling up, a key problem remained: too many of the personnel were new to their roles and lacked institutional knowledge, including Guderian himself. Guderian relied heavily on Colonel Johann von Kielmansegg who was the most senior staff officer with experience at the OKH, but he was himself arrested in August. The situation was not improved by Guderian's long-standing bias against the General Staff which he blamed for having allegedly opposed his attempts to introduce modern armored doctrine into the army back in the 1930s. The latter months of 1944 were marked by the ever-increasing strife between the OKH and the OKW (Oberkommando der Wehrmacht) as the two organizations competed for resources, especially in the run-up to the last-ditch German December 1944 offensive on the Western Front. After the war, Guderian blamed Hitler for frittering away the last German reserves in the operation; nonetheless, Germany's strategic situation was such that even twenty or thirty extra divisions would not have helped.