Selling a war to an unsuspecting public.
The seller, often a chickenhawk could be anyone with influence, such as an elected official or a talk radio blowhard, who paints the best possible picture of war, ignores the negative aspects of war, and warns of dire consequences of not going to war. Often war mongering hides behind patriotism and the loyalty of troops to deflect criticism.

When you eat dirt for the first time and leave your family to build a shack in the woods