rain iron
v. phr.— «Though surrounded by sandbags piled 5 feet high, they offer little safety from a direct hit by a rocket or mortar, which are lobbed over the wire nightly. “Raining iron,” the soldiers call it, and smile.» —“The Doctors of War” by Bob Drury Men’s Health Jan. 30, 2006. (source: Double-Tongued Dictionary)