When Brigadier General Henri Paixhans introduced his concepts of ship-mounted shell guns, he virtually ended the rule of the sea by wooden ships of the line. Paixhans and others like John A.B. Dahlgren, developed guns that could fire explosive shells which tore rugged holes in vessels, send shrapnel and sparks across the decks, causing a wooden warship to burn. The introduction of shellguns and rifled guns to naval warfare prompted the development of ironclads which changed naval warfare forevermore. Technology now rules the waves.