<P> In baseball, a grand slam is a home run hit with all three bases occupied by baserunners ("bases loaded"), thereby scoring four runs--the most possible in one play . According to The Dickson Baseball Dictionary, the term originated in the card game of contract bridge, in which a grand slam involves taking all the possible tricks . The word slam, by itself, usually is connected with a loud sound, particularly of a door being closed with excess force; thus, slamming the door on one's opponent (s), in addition to the bat slamming the ball into a home run . </P> <P> Roger Connor is believed to have been the first major league player to hit a grand slam, on September 10, 1881, for the Troy Trojans . Although Charlie Gould hit one for the Boston Red Stockings (now the Atlanta Braves) in the National Association (NA) on September 5, 1871, the NA is not recognized by MLB as a major league . </P>

Where did the term grand slam come from