On 15 September, as York marched against Menin, Hédouville left Menin with part of his division and sent Demars' brigade of 3,000 men down the Lys river to threaten Courtrai.
With the bulk of Hédouville's Division en route to Lille, Demars was left outside Menin to hold the Allies off until night, but the appearance of Erbach's command placed them in full flight [REF].