Soon after arriving in France, the division received its number, becoming 50th (Northumbrian) Division, the brigades being numbered 149, 150 and 151, and the Signal Company numbered 50. 1/1st Northumbrian Field Company rejoined the division on 2 June 1915, and the divisional engineers were further reinforced on 17 June by 7th Field Company, RE, a Regular unit. 7th Field Company had landed in France with 4th Division on 22 August 1914, and had served through the Retreat from Mons, and the battles of the Marne, Aisne and Armentières. It had been attached to 48th (South Midland) Division for a few weeks before joining 50th Division.