Abstract: The present application describes a sensor network and method for monitoring and detecting intrusion activities in accordance with various illustrative embodiments. In one embodiment, a method includes receiving a first input from a first sensor at a first sensor node of a wireless ad hoc sensor network, and comparing the first input to a first predefined input threshold associated with an intrusion activity. The method also includes wirelessly communicating an indication of the intrusion activity to a gateway device via a second sensor node of the wireless ad hoc sensor network. The gateway device may include an interface between the wireless ad hoc sensor network and a user-interactive system configured to monitor the wireless ad hoc sensor network.