This very decisive battle was won by the Union who used their artilery to fool the Confederates into thinking that they had no ammo left. The Union then waited for their advance and shot them with grape shot, which is a shot that contains many small cannonballs, that when fired the are torn apart into shrapnel. The shot is like a shotgun, and is very deadly to infantry. The lines led by Pickett, were shredded to peices. Lee later took blame for it. This marked a turn for the worse for the south.