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By the autumn of 1914, the campaign on the Western Front was bogging down into Trench warfare and the British Expeditionary Force (BEF) had an urgent need for batteries of siege artillery. The WO decided that the TF coastal gunners were well enough trained to take over many of the duties in the coastal defences, releasing Regular RGA gunners for service in the field, and 1st line TF RGA companies that had volunteered for overseas service had been authorised to increase their strength by 50 per cent.