Thunder in the Morning is Homer H. Grantham's account of a Marine Corps six-man naval gunfire spotting team in a joint assault signal company participating in two of the four battles fought by the First Division of the U. S. Marine Corp during World War II in the Pacific.

The gunfire spotting team had two radio men, two telephone men, a scout, and one officer as the spotter. The team landed in the third wave of the Peleliu assault and called in covering fire using ship-to-shore radio communications with destroyers, cruisers, and battleships during eight days of heavy fighting.