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Field Marshal Putnik ordered a retreat into the surrounding hills and the front settled in a month and a half of trench warfare, which was highly unfavourable to the Serbs, who possessed heavy artillery that was largely obsolete, had short ammunition stocks, limited shell production (having only a single factory producing around 100 shells a day) and also a lack of proper footwear, since the vast majority of infantry wore the traditional (though state-issued) opanaks, while the Austro-Hungarians had soak-proof leather boots. Most of the war material was supplied by the Allies, who were short themselves. In such a situation, Serbian artillery quickly became almost silent, while the Austro-Hungarians steadily increased their fire. Serbian daily casualties reached 100 soldiers from all causes in some divisions.
During the first weeks of trench warfare, the Serbian Užice Army (one strengthened division) and the Montenegrin Sanjak Army (roughly a division) conducted an abortive offensive into Bosnia. In addition, both sides conducted a few local attacks, most of which were soundly defeated.
The Battle of Nsanakong or Battle of Nsanakang took place between defending British and attacking German forces during the Kamerun Campaign of the First World War. The town of Nsanakong had been occupied by the British on 30 August 1914. On 6 September, German forces attacked, driving the British force over the border back into Nigeria. Forces from British Nigeria had attempted to move into German Kamerun from a number of points along the colony's northern border. Attempts to do this at the First Battle of Garua and Mora had failed. Further south, a British column from Ikom crossed the Cross River into Kamerun and occupied the station of Nsanakong, 5 kilometers from the Nigerian border on 30 August. A week following the British occupation of Nsanakong, at two o'clock in the morning on 6 September 1914, German forces surrounded the village. The Germans, armed with machine guns, attacked. The British defenders successfully repulsed this initial attack but in the process exhausted their ammunition. Another German attack came at five o'clock in the morning, this time from higher ground. The British could not repulse this one due to their lack of ammunition and attempted to break out by conducting a bayonet charge. The result was disastrous for the British. They lost about 100 men which was equivalent to approximately half of their force during the battle, including eight of their eleven British officers. German losses were also heavy with 40 dead including the commanding officer, Captain Rausch Emil. After suffering heavy casualties, the remaining British units successfully retreated back into Nigeria.