Finally, the biggest Billy Goat Gruff came over the bridge.  Trip trap trip trap went his hooves.  "Who goes trip trap trip trap across my bridge?" roared the troll."It is I, Great Big Billy Goat Gruff," said the biggest goat.  "Then I am coming to eat you up!" roared the troll.  "Come on up, then!" yelled Great Big Billy Goat GruffGreat Big Billy Goat Gruff was strong.  He put his head down and butted the ugly troll right off the bridge. The troll fell into the river and was carried away.   He was never seen again.The three Billy Goats Gruff found their field of sweet green grass and ate their fill.  Maybe they are still there today.