In October 1915, British and French soldiers arrived in Thessaloniki in northern Greece in order to take part in what became known as the Macedonian or Salonika Campaign. This Campaign proved productive for the development of archaeology in the region for a number of reasons that this paper will explore. A combination of political necessity, military activity and archaeological opportunism resulted in the discovery and reporting of large numbers of sites and finds in the area of Macedonia under Allied control. The collection of these finds in Thessaloniki fostered collaboration between British, French and Greek archaeologists which continued after the War. This was despite the removal of many finds to the UK and France at the end of the War. Renewed interest in these wartime collections as a result of various centenary celebrations has led to a better understanding of the archaeology of the Macedonian Campaign and its continuing significance.