During a war, don’t be the soldiers. Be the one serving the soldiers.
When there’s a big war going on and lots of people flock to a certain field or area, the chances of you joining that war and winning or gaining something is very slim. That’s why you should avoid the war and serve the war participants instead.
For example, during the gold rush where hundreds of thousands of people started digging for gold, the chances of you finding gold as a gold digger is very low. But if you sell gold mining equipment or serve the many gold diggers around you, you will very likely make a small fortune, even if you didn’t find any gold.