You know your command held yet another unauthorized late-night party when you find your tent covered in hay and a lobster head stuck on your ridge pole in the morning. If the Yankees are in range, so are you. Incoming fire has the right of way. The easy way is always booby-trapped. Try to look unimportant, the sharpshooters will overlook you.
Professionals are predictable, it's the amateurs that are dangerous.
When you're ready for them. When you're not ready for them. If you can't remember, the enemy's cannon are generally pointed at you. If your attack is going well, you have walked into an ambush. Don't draw fire, it irritates the officers around you.