The URN's primary passive defensive system is the use of a multi-layered armor scheme which is designed to stop, dissipate, and or deflect an incoming attack. This is achieved through the use of standard armor plating, electric reactive armor, and the effective use of double hulls and their resulting hull cavities.

While the Umbrian Republic Navy utilizes railguns for both point defense and ship to ship engagements, they supplement these weapons with extensive missile armament on most warships. Housed in vertical launch tubes buried in the outer hull of the vessels themselves, small frontline warships may carry hundreds of these munitions, while the largest battleships are equipped with thousands.

The basic formation of the Umbrian Republic Army, the legion is a unit of ten thousand soldiers which is considered large enough to allow for independent tasking and assignment. A legion's equipment will vary based on the type of legion and its specific mission parameters. It may also be augmented with independent sub-units which provide specific support functionality.

The first thing an Archus commanding their fleet needed to consider was the features of the battlespace which he or she would fight in. Gravitational fields, surrounding astronomical features, and even space weather could all influence the outcome of a battle. Once the field of battle was chosen, the course of events generally followed a similar pattern.

While superseded by the latest generation of plasma-based weaponry, firearms continue to be used by military, paramilitary, and law enforcement organizations throughout the Republic, as they are cheap to manufacture and reliable in all manner of conditions.

The Umbrian Republic Army has a long tradition of using vehicles to enhance the mobility and firepower of the Republic's legions. The traditional legionary structure is highly dependent on light infantry, and these armored personnel carriers and infantry fighting vehicles are vital to providing them with the maneuverability necessary to fight in the varied terrain types and environments they may encounter.