It was reformed in 1914 and served on the Western Front as part of the 3rd Cavalry Division until the end of World War I.

[a] For the Hundred Days Campaign, he numbered his British cavalry brigades in a single sequence, 1st to 7th.

[b] The 7th Cavalry Brigade consisted of: It was commanded by Colonel Sir Friedrich von Arentschildt.

[11] Stationed to the rear of the infantry squares, it helped to fend off Ney's massed cavalry attacks from 4pm onwards.

[17] The brigade landed at Zeebrugge on 7 October 1914[17] and deployed to the Western Front in France and Belgium.

The British and Canadian units remained in France[20] and most of them were transferred to the 3rd Cavalry Division causing it to be extensively reorganized.

[14] At other times, the brigade formed a dismounted unit and served in the trenches (as a regiment under the command of the brigadier).

[22] At the Armistice, units of the division had reached the River Dender at Leuze and Lessines in Belgium, when orders were received that they would cover the advance of the Second Army into Germany.

Transport difficulties meant that the only one cavalry division could advance with Second Army so the following winter was spent in Belgium.