Flies and Spiders

They attached a hook to a piece of rope and tossed the rope until it snagged the boat, which they then pulled across.

Fili picked up the hook when he had drawn it back, rather doubtfully all the same. This time he threw it with greater strength.
"Steady!" said Bilbo, "you have thrown it right into the wood on the other side now. Draw it back gently." Fili hauled the rope back slowly, and after a while Bilbo said:
"Carefully! It is lying on the boat; let's hope the hook will catch."
It did. The rope went taut, and Fili pulled in vain. Kili came to his help, and then Oin and Gloin. They tugged and tugged, and suddenly they all fell over on their backs. Bilbo was on the lockout, however, caught the rope, and with a piece of stick fended off the little black boat as it came rushing across the stream. "Help!" he shouted, and Balin was just in time to seize the boat before it floated off down the current.