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Distinguishing Flags of the British Army (WWI)

Introduction
Headquarters of an Army in the field
Headquarters of a Division
Headquarters of a Brigade or an administrative district
Headquarters of a G.O.C. or O.C. of a line of communication
Headquarters of a Post, Garrison, or Base
Ammunition Column
Supply Depot
Hospital or Field Ambulance
Ordnance Depot
Veterinary Hospital
Telegraph Office
Post Office
Pay Office

See also:

Introduction

The Distinguishing Flags of the British Army in WWI shown below come from Graham Bartram's World Flags Database websiteand from a range of printed publications.
Miles Li, 3 February 2018

Headquarters of an Army in the field

image by Miles Li, 3 February 2018

The Union Jack.
Miles Li, 3 February 2018

Headquarters of a Division

image by Miles Li, 3 February 2018

The number of the Division would be shown in white.
Miles Li, 3 February 2018

Headquarters of a Brigade or an administrative district

image by Miles Li, 3 February 2018

Headquarters of a G.O.C. or O.C. of a line of communication

image by Miles Li, 3 February 2018