Annual training for 1st London Division had just started when war was declared on 4 August 1914, and the City of London Brigade promptly mustered at Bloomsbury for mobilisation.
The infantry of the division were soon posted away to relieve Regular Army garrisons in the Mediterranean or to supplement the British Expeditionary Force on the Western Front.
By January 1915, only the artillery and other support elements of the division remained in England, and these were attached to the Second Line TF division (58th (2/1st London) Division) that was being formed.
The City of London Brigade became 1/I City of London Bde and formed 2/I City of London Bde, which served with the 58th Division throughout the war.

Colonel J. Stollery, who commanded  I City of London Brigade, had been with the unit since 1874 and was too old for overseas service, so he remained behind to train the 2/I Brigade.
So many recruits came forward, including many who had previously served with the brigade and whose training could be quickly refreshed, that the 2/I Brigade was soon completed, and a 3rd Line Brigade was also formed to supply reinforcements to the other two.
Annual training for 1st London Division had just started when war was declared on 4 August 1914, and the City of London Brigade promptly mustered at Bloomsbury for mobilisation. The infantry of the division were soon posted away to relieve Regular Army garrisons in the Mediterranean or to supplement the British Expeditionary Force on the Western Front. By January 1915, only the artillery and other support elements of the division remained in England, and these were attached to the Second Line TF division (58th (2/1st London) Division) that was being formed. The City of London Brigade became 1/I City of London Bde and formed 2/I City of London Bde, which served with the 58th Division throughout the war.
Colonel J. Stollery, who commanded  I City of London Brigade, had been with the unit since 1874 and was too old for overseas service, so he remained behind to train the 2/I Brigade. So many recruits came forward, including many who had previously served with the brigade and whose training could be quickly refreshed, that the 2/I Brigade was soon completed, and a 3rd Line Brigade was also formed to supply reinforcements to the other two.
City of London Artillery