that's right. I think the impact is even bigger than that. but the most important thing I think is the economy, especially in terms of food. in war food remains the main source of human energy. if there is a war of course its circulation will be very difficult. I think this is the main problem that is more serious than anything else from the war.
Wars put a stop to everything. Any advances in economic, technological and infrastructural development would be lost. A country having entered a full blown war with an equally formidable opponent would prioritize the need to crush their enemies and win the war than how the economy is faring. The sooner the war is over, the sooner growth and progress can again resume.
You would be really lucky if a country in an all out war manages to grow enough food to even consider circulating.
Food products normally imported would decrease to the barest minimum or even stopped as funds would be diverted to the war efforts. So I think ending the war would be more serious.