Uhh, not exactly.
Edmund Ruffin, noted Virginian agronomist and secessionist, claimed that he fired the first shot on Fort Sumter. His story has been widely believed, but Lieutenant Henry S. Farley, commanding a battery of two 10 inch siege mortars on James Island fired the first shot at 4:30 A.M. (Detzer 2001, pp. 269–71). No attempt was made to return the fire for more than two hours. ... At about 7:00 A.M., Captain Abner Doubleday, the fort's second in command, was given the honor of firing the union's first shot, in defense of the fort.
http://en.wikipedia.org/wiki/Fort_Sumter#CITEREFDetzer2001
Before the chorus of wiki-detractors chimes in, may I point out that they are free to post evidence that wiki is inaccurate in this case?
He can claim it but that doesn’t mean it is true.