Army
An 
Army is a combat unit used for Terrestrial Warfare and annexation. Each army belongs to a nation, and may be controlled by a faction. An army may also have an attached navy.
Armies are constructed with the 
Build Army Priority, and cost 
IP from their home nation to maintain them.
Controlling Armies
If there are armies controlled by the nation, owning a control point may also grant you direct control of said armies. Whenever a nation gains an army, that army will be assigned to a control point. It will attempt to balance the number of armies per control point by going to a control point with the fewest armies possible, and it will always go to the rightmost of those control points.
- Example 1: If all control points have the same number of armies, then the new army will always go to the Executive.
- Example 2: If the Executive has an army and the Legislature doesn't, then the Legislature will get the army instead, to balance the number of armies per control point.
The controller of an army may order the army to move, which also implicitly determines if and when it engages in combat. For details, see Terrestrial Warfare. If an army has no controller, it will operate under the generic national AI, which will focus on defending its own nation (and especially its capital) as its top priority, but will also engage in any other wars where it can participate.
Control Points with armies attached to them are shown with the symbol. If there is more than one Army attached to a control point, the number of attached Armies is also shown over the symbol.
Armies will not change control immediately when a control point changes owner. Instead, they will change control only when the next missions phase takes place. Until then, the army stays in control of its previous owner. Similarly, newly built armies are under the control of the generic national AI until the next missions phase.
Army Caps
An army needs two things: 
Population and land.
- Each army needs its own unique home region that is:
- Not shared by any other army.
- Not a
colony region. - Not occupied by enemy forces.
- The first army in each nation needs 5 million
Population in the nation. Every subsequent army needs a total pop of 25 million Population per army.
- In other words, a nation of 5 million can build 1 army, but you need 50 million to build a second army, 75 million to build a third army, etc.
If a nation reaches its army cap, it can no longer invest IP in the Build Army Priority. Any points that have already been invested will be saved in the background, however, and if the nation ever regains the ability to build new armies, the points will re-appear. If a nation is peacefully unified with another nation, the new unified nation will inherit any un-spent IP from each of the original nations.
Some nations do not begin with any military, and must first complete the 
Found Military Priority before they can use the Build Army Priority to build any armies.
Build and Maintenance Costs
Armies cost IP to build, and maintaining armies reduces a nation's IP income. The exact costs vary by scenario (see below). Maintenance costs for armies and navis can reduce a country's IP income to zero, but there is no other penalty to a country (or its armies/navies) if maintenance costs exceed IP income.
Scenario-Specific Costs
Armies have different characteristics in the Broken Earth scenario than they do in the other scenarios.
| Characteristic | 2022/2026/2070/ 2003 Value |
Broken Earth Value
|
|---|---|---|
| Army Cost | 60 IP |
40 IP
|
| Army Maintenance (Home) | 0.5 IP/month |
0.2 IP/month
|
Armies away from home cost 1.0 IP/month in all scenarios.
Game Text
Armies are powerful and expensive assets that belong to nations. Each army represents multiple divisions of troops, air support, and a logistics train sufficient for the unit to take and hold territory outside their home nation's borders.
Naval armies are supported by a combat and transport fleet, and are able to cross oceans if the nation's naval score exceeds that of its enemies.
Armies are bound to a particular control point in a nation; the owner of that control point commands the army's actions. Use of armies on foreign soil are subject the nation's relations; they may be stationed in allied nations and only enter the territory of hostile nations during war.
Each nation may have one army per region it controls; if a region joins another nation, any armies based in that region will belong to the new nation.
~ Nation UI Tooltip for Armies, Terra Invicta, 0.4.86.
