Entrenching battalions were temporary units formed in the British Army during the First World War. Allocated at Corps level, they were used as pools of men, from which drafts of replacements could be drawn by conventional infantry battalions. In addition to the entrenching battalions of the British Army, there were also entrenching battalions in both the Canadian Expeditionary Force. In addition, the New Zealand (Māori) Pioneer Battalion served with the New Zealand Expeditionary Force.