Serbian Front:—French and Serbian forces approach the Danube near the Roumanian border.
The British monitor M 21 is mined off Ostend.
Oct. 21 (Mon.)
The Germans temporarily gain the protection of water (the Scheldt and its canals and other waterways) from the Dutch frontier to the neighbourhood of Valenciennes.
The British 5th Army reaches Tournai.
Oct. 22 (Tues.)
The French and Belgians advance upon Ghent; they cross the Lys Canal.
The British 1st Army enters the western outskirts of Valenciennes.
Further south the French advance on the River Serre Front.
Serbian Front:—The French occupy Negotin.