desperately shored up weak points with soldiers stripped from less threatened positions. Ludendorff was so distraught on the phone to OHL that General Wilhelm Groener (who directed the army's railroads and had been a competitor with Ludendorff on the General Staff) was sent to evaluate his nerves, which were judged satisfactory. For a week the Russians kept attacking: they lost 80,000 men; the defenders 16,000. On 16 July the Russians attacked the German lines west of Riga but were ultimately thwarted. When looking back on the Russian offensive, Hindenburg admitted that another attack of such scale and ferocity would have left his forces "faced with the menace of a complete collapse." Commander of the Eastern Front After having their strength decimated by the Russians in the Brusilov Offensive, the Austro-Hungarian forces submitted their Eastern Front forces to Hindenburg's command on 27 July (except for Archduke Karl's Army Group in southeast Galicia, in which General Hans von Seeckt was chief of staff). General von Eichhorn took over Army Group Hindenburg, while Hindenburg and Ludendorff, on a staff train equipped with the most advanced communication apparatus, visited their new forces. At threatened points they formed mixed German and Austro-Hungarian units while other Austro-Hungarian formations were bolstered by a sprinkling of German officers. Officers were exchanged between the German and Austro-Hungarian armies for training. The derelict citadel of the Brest Fortress was refurbished as their headquarters. Their front was almost and their only reserves were a cavalry brigade plus some artillery and machine gunners. Supreme Commander of the Central Powers In the west, the Germans were hemorrhaging in the battles of Verdun and the Somme. Influential Army officers, led by the artillery expert Lieutenant Colonel Max Bauer, a friend of Ludendorff's, lobbied against Falkenhayn, deploring his futile steamroller at Verdun and his inflexible defense along the Somme, where he packed troops into the front-line to be battered by the hail of shells and sacked commanders who lost their front-line trench. German leaders contrasted Falkenhayn's bludgeon with Hindenburg's deft parrying. The tipping point came when Falkenhayn ordered a spoiling attack by Bulgaria on Entente lines in Macedonia, which failed with heavy losses. Thus emboldened, Romania declared war on Austro-Hungary on 27 August, adding 650,000 trained enemies who invaded Hungarian Transylvania. Falkenhayn had been adamant that Romania would remain neutral. During the Kaiser's deliberations about who should command Falkenhayn said "Well, if the Herr Field