No battleplan ever survives contact with the enemy. Friendly fire ain't. The most dangerous thing in the combat zone is an officer with a map. The problem with taking the easy way out is that the enemy has already mined it. The further you are in advance of your own positions, the more likely your artillery will shoot short.
Incoming fire has the right of way.
If your advance is going well, you are walking into an ambush. The quartermaster has only two sizes, too large and too small. If you really need an officer in a hurry, take a nap. The only time suppressive fire works is when it is used on abandoned positions. The only thing more accurate than incoming enemy fire is incoming friendly fire.