percent of Russian ammunition requirements were supplied by Britain and the USA. As the Western companies were also responsible for supplying the needs of the Western Front, only a small proportion of the required quantity could be transported to Russia. In the following year, the Russian armaments industry was able to increase its production figures by a factor of two and a half and, despite the insufficient help of the Allies to cover the needs of the Russian army. Romania enters the war Up until 1916, the Romanians followed the tides of war with interest, while attempting to situate themselves in the most advantageous position. French and Russian diplomats had begun courting the Romanians early on, but persuasion tactics gradually intensified. For King Ferdinand to commit his force of half a million men, he expected the Allies to offer a substantial incentive. Playing on Romanian anti-Hungarian sentiment the Allies promised the Austria-Hungarian territory of Ardeal (Transylvania) to Romania. Transylvanian demographics strongly favoured the Romanians. Romania succumbed to Allied enticement on 18 August 1916. Nine days later, on 27 August, Romanian troops marched into Transylvania. Romania's entry into the war provoked major strategic changes for the Germans. In September 1916, German troops were mobilized to the Eastern Front. Additionally, the German Chief of the General Staff, General Erich Von Falkenhayn was forced to resign from office though his successor appointed him to command the combined Central Powers forces against Romania, along with General August von Mackensen. Kaiser Wilhelm II immediately replaced Falkenhayn with Paul von Hindenburg. Von Hindenburg's deputy, the more adept Erich Ludendorff, was given effective control of the army and ordered to advance on Romania. On 3 September, the first troops of the Central Powers marched into Romanian territory. Simultaneously, the Bulgarian Air Force commenced an incessant bombing of Bucharest. In an attempt to relieve some pressure, French and British forces launched a new offensive known as the Battle of the Somme, while the Brusilov offensive continued in the East. The entrance of Romania into the war was disconcerting for von Hindenburg. On 15 September, Paul von Hindenburg issued the following order, stating that: "The main task of the Armies is now to hold fast all positions on the Western, Eastern, Italian and Macedonian Fronts, and to employ all other available forces against Rumania." Fortunately for the Central Powers, the quantity and quality of the Romanian Army was overestimated.