This study covers the heroic defense of the Oise in the vicinity of Guise by the 228th Reserve Infantry Regiment (French) during the 28th and 29th of August 1914. It includes the concentration, advance and retirement of the IV Reserve Corps. According to the author, the study brings out the lack of liaison and communication in all echelons of command, need for battle training, armies operating together, necessity of a coordinated and organized defense, and difficulty in daylight withdrawals. The second part covers operations that discuss reconnaissance and information, contact, delaying action, gaps between two diverging armies, and movement from one flank of an army to the other.