What does make a silver bridge for flying enemy mean?

"Make a silver bridge for the flying enemy" is a euphemism for shooting or killing someone, specifically in the context of war or combat. It implies that the person being targeted is an enemy, and that they will be "bridged" to the afterlife by the bullets or other projectiles that are fired at them.

This phrase is usually used in a metaphorical sense, and is not intended to be taken literally. It is similar to other euphemisms for killing, such as "sending someone to meet their maker" or "putting someone out of their misery."