This paper is based entirely on the book Serbia’s Part in the War by Crawford Price. The author traced Price’s account of the 3rd Invasion and checked the results against the positions and maneuvers of the various armies. Serbian military organization, Serbian armies, Austrian armies, the events by date from December 4th to December 15th, as well as brief analysis given by comparing methods/tactics and maneuvers used by both the Austrians and the Serbians, are revealed. There are two maps included- the Balkans in 1915 and Eastern Europe.