I'd believe it. It's one of the most basic and probably is the most emphasized tactic in US battle drills.
Gain fire superiority. Gain fire superiority. Say it with me: Gain fire superiority.
It relates to every single engagement: From man on man to force on force, and everywhere in between. It was one of the major premises behind the "liberation" of Afghanistan from the Taliban in 2001, and explains why everyone is always fighting tooth and nail for dedicated Close Air Support.
Gain Fire Superiority.