Brigade battle patch of the 23rd Brigade of the British 8th Division in the First World War. worn on  at the top of both sleeves, this patch was worn by brigade HQ only. Subordinate units wore arcs of differing colours or with additional symbols.
Hibbard, Mike; Gibbs, Gary, Infantry Divisions, Identification Schemes 1917, The Military History Society, 2016, Wokingham, no ISBN
Usedtoknowthat