The ever-increasing power demand and more frequent extreme weather results in increasing number of grid outage events. This paper proposes a resilient energy management scheme for a building community prototype installed with community-scale photovoltaic solar panel and Battery Energy Storage System (BESS), aiming to enhance self-power supply capability of the community during the grid outage period. The scheme harnesses the community-scale renewable energy source and Battery Energy Storage System (BESS), and flexibility of building load shifting to maximize a warfare objective, i.e. the sum of served load of all buildings in the community over the grid outage horizon. An optimization algorithm previously proposed by the authors – Natural Aggregation Algorithm (NAA) is applied to solve the energy management model. Simulations are conducted based on the Australian "Smart Grid, Smart City" dataset to validate the effectiveness of the proposed method.