Did the war pay for the war? An assessment of napoleon's attempts to make his campaigns self-financing

Pierre Branda

“You must make it your guiding principle that the war must feed the war,” Such was Napoleon’s recommendation to Marshal Soult when he appointed the latter général en chef of the Army of the South in Spain.

https://www.cairn-int.info/article-E_NAPO_083_0001a--did-the-war-pay-for-the-war-an.htm