He directed the 3rd Division at the battle of the Marne, the advance to Sainte-Menehould and the Argonne, being wounded on 15 September 1914.
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In 1913 he was appointed to Paris, again as counsellor, and moved to Bordeaux when the French government relocated there in September 1914 as the German army approached the capital before the First Battle of the Marne.
On 5 September, as his battalion moved forward to take part in the First Battle of the Marne, Highgate was apprehended in a barn on the estate of Baron de Rothschild at Tournan-en-Brie by the gamekeeper.
First Battle of the Aisne (12–15 September 1914), Anglo-French counter-offensive following the First Battle of the Marne