Historically, an early example is the Peloponnesian War between the greeks and spartans from 431 to 404 BC where the greeks stared debasing their currency to fund the war by mixing in copper in the gold and silver causing massive inflation.
A recent example is the Iraq war which costs the US over 1.1trillion dollars but the true costs are much , much higher as there are hidden opportunity lost costs and amortized pension and health costs. A small portion of the price of war is raised with war bonds but most nation states simple fund wars by printing more currency which has longterm economic effects which reflect in inflation and recessions in years to come.
Blowing things up instead of investing in education, building infrastructure, and focusing on job growth isn't exactly good for an economy.