27 August

Western Front

 * British fall back from St. Quentin.
 * Lille and Mézières occupied by the Germans.
 * Namur: Last of the forts reduced.
 * Ostend occupied by mixed British force (Marines, etc.).

Eastern Front

 * Galicia: Russians capture Halicz and Tarnopol.

Naval and Overseas Operations

 * SS Kaiser Wilhelm der Grosse sunk by HMS Highflyer.
 * SMS Magdeburg, German cruiser, destroyed in Gulf of Finland.

Political

 * France: M. Viviani's Ministry reconstructed: entry of M. Millerand (War) and Delcassé (Foreign Affairs).