Up,
It's a huge issue right now (patch 1.0.5).
I joined the Aserai kingdom and they're at war with southern Empire.
They send an army, from Sanala city, of 1k to conquer the Vostrum city. I joined the army and as we were moving, I checked how much food do they have and they had only about 3 days of food.
I went to the closest city and baught more food so they don't starve. But soon as the war was over, without conquering the city, the army stop at Zeonica city and, for some reason, stay there for about 10 days. Just going from Zeronica to Onica Castle, over and over and over until they dismissed the army.
As I'm the only one who's having a food, you can imagine the army destruction. They lost around 400 men by starvation.
No one stop to buy a food, especially the king, not even to Quyaz, he just went back to Sanala and lost around 150 men.
Maybe that's main reason why the other kingdoms (Northern Empire, Sturgia) lost their army soo fast. They just make them starve to death.
Sorry for mistakes, english is not my main language.