A tactical network comprising: a plurality of assets, at least some of the assets grouped into sub-groups, the assets within each sub-group communicating with each other using a communication protocol, the sub-groups including: a first sub-group in which the assets all communicate with each other using a first communication protocol, and a second sub-group in which the assets all communicate with each other using a second communication protocol which is incompatible with the first communication protocol, each of the first and second sub-group being associated with a respective first and second federated server, each of the first and second federated servers (140, 140') being configured: to receive data from the assets in the associated first and second sub-group, to assess the received data and identify significant changes therein, to convert the significant changes in the received data into a format that is common to all of the federated servers in the tactical network, and to transmit, in the common format, to the other of the first and second federated servers, the significant changes. a plurality of assets, at least some of the assets grouped into sub-groups, the assets within each sub-group communicating with each other using a communication protocol, the sub-groups including: a first sub-group in which the assets all communicate with each other using a first communication protocol, and a second sub-group in which the assets all communicate with each other using a second communication protocol which is incompatible with the first communication protocol, each of the first and second sub-group being associated with a respective first and second federated server, each of the first and second federated servers (140, 140') being configured: to receive data from the assets in the associated first and second sub-group, to assess the received data and identify significant changes therein, to convert the significant changes in the received data into a format that is common to all of the federated servers in the tactical network, and to transmit, in the common format, to the other of the first and second federated servers, the significant changes. a first sub-group in which the assets all communicate with each other using a first communication protocol, and a second sub-group in which the assets all communicate with each other using a second communication protocol which is incompatible with the first communication protocol, each of the first and second sub-group being associated with a respective first and second federated server, each of the first and second federated servers (140, 140') being configured: to receive data from the assets in the associated first and second sub-group, to assess the received data and identify significant changes therein, to convert the significant changes in the received data into a format that is common to all of the federated servers in the tactical network, and to transmit, in the common format, to the other of the first and second federated servers, the significant changes. to receive data from the assets in the associated first and second sub-group, to assess the received data and identify significant changes therein, to convert the significant changes in the received data into a format that is common to all of the federated servers in the tactical network, and to transmit, in the common format, to the other of the first and second federated servers, the significant changes.