This article reconstructs the heated – local and national – debate around the consistent and pervasive foreign presence in the border territory of Lake Garda on the eve of the Great War. Here, the growing nationalistic tensions that preceded the conflict intertwined with the emerging hospitality industry. Tourism, seen as a social phenomenon, can thus offer a privileged perspective on the transformations of the general context of the time. Introduced by Austro-Germanic inhabitants of the lake at the turn of the nineteenth and twentieth centuries, the hospitality industry on Lake Garda flourished up to the eve of the Great War. There were, however, also opponents to this model of development. The dispute escalated to the point that, in the perception of the locals, the ‘outsiders’ turned into ‘enemies’ and Lake Garda increasingly became a disputed area: a symbol of the tensions of the time.