Abstract: Embodiments of an apparatus configured for attachment to a firearm are described herein. In some embodiments, processing circuitry may be configured to process outputs of one or more accelerometers to identify a firearm discharge event, capture firearm orientation data provided by an attitude sensor and a geolocation of the firearm at a time of the firearm discharge event, and encode a firearm discharge message comprising the firearm orientation data, the geolocation, and the time, for transmission via a communication interface. In some embodiments, the apparatus may be configured for target tagging. Some embodiments are directed to a battlefield information node configured to decode a plurality of firearm discharge messages received, via a communication interface, from one or more other battlefield information nodes. Each firearm discharge message may comprise firearm orientation data, a geolocation, and a time associated with a firearm discharge event.