In this paper I examine the practices of encountering o f Occupy London, and argue that they provide a means for rethinking the production o f territoriality. Specifically, I argue that boundary making not only involves hierarchical relations o f power-over but also the articulation o f bottom-up power-to. I first examine literature on boundary making, and propose encountering as a more appropriate vocabulary to represent this practice in the context of urban activism. I then conceptualise encountering as the articulation o f powerto, a moment in the production of territoriality from below, bringing together Holloway's dialectical understanding o f power and Lefebvre's writings on territorial autogestion and urban encounters. In the remainder o f the paper I examine practices o f encountering in Occupy London on the basis o f militant research with the movement that combined ethnography, interviews, and archive analysis. The paper focuses on the spaces of the General Assembly and the protest camp, exploring how encounters were productive of new social relations and highlighting key tensions. In particular I note the inevitable ephemerality o f activist encounters and tensions over institutionalising encounters, and I end by calling for greater attention to the power relations involved, warning against assumptions that encounters o f power-to necessarily lead to positive outcomes.