This guide will give a concise rundown of how the nations experience
and participate in wars.

Status:

They’re no different than any other citizen fighting for
their country. In other words, they aren’t given any special treatment.

Ex: There’s a comic gag regarding how terrible it was to be
a Russian soldier.

So much so, that Russia becomes ecstatic when Germany takes
him as a prisoner of war.

Sources: Volume 1. 

Ex: During WW2, Germany is said to tolerate his way through
pain every day.

Source: Hetarchive, Hetare 5: Lietuvis. 

When captured as a prisoner of war himself, he states that
torture is no more than a mosquito bite to him.

Source: Volume 1. 

Regarding food, they’re not allocated extra supplies. If
their population is starving, so are they.

Source: Hetascanlations, World Stars Chapter 120. 

They’re given rations just like any other soldier.

Source: Volume 5, Let’s Eat Military Rations!

They fight with their people rather than being fought for.

Source: Volume 4, The Ruler of Scandinavia and the King of Eastern Europe.

Post locations:

Nations can serve on the ground, the navy, and
the air.

Sources: Volume 3,  A Battlefield’s Kickoff + Hetarchive, Hetare 3: Nonagression pact + Hetarchive, Germany & Cohabitation.

Missions:

They get missions from their bosses.

Ex: Germany is tasked with annexing Austria.

Source: Hetarchive, The Austrian Anschluss.

Ex: Germany and Prussia are asked to infiltrate America’s war
camp.