It was Bilbo who did most of the fighting. The dwarves were still groggy due to the spider poison.
Stay on the path, be nice to Elves, and make sure you have a wizard and hobbit. You will be walking or riding ponies for most of the way...... and remember to bring something you can use to fight off giant spiders!
The spiders.
Giant spiders, reportedly descended from Ungoliant, and relations of Shelob, the great spider in The Lord of the Rings. The Dwarves and Bilbo ran into them when they strayed off the forest road against the advice of Gandalf. The original account can be read in Chapter 8 of The Hobbit "Flies and Spiders." Or you can read a summary of the chapter at the related link.
No the Giant spiders don't poison you, the only spiders in the game which are capable of poisoning you are called "Poison Spiders".
Spiders, trolls and wood-elves
Aragog. He is the reason Hagrid was expelled from Hogwarts as they thought he was the creature that lived in the Chamber of Secrets and killed Moaning Myrtle.
Bilbo rescues the dwarves after they were captured by the spiders. He cuts them down from the webs and distracts the spiders while the rest escape.
giant spiders
Hang them up, keep them alive, and then eventually eat them.
No, there are no known species of giant spiders that exist in reality. The largest spiders in the world, such as the Goliath bird-eating spider, are not considered "giant" in comparison to humans. The idea of giant spiders is often found in folklore, myths, and fiction.
Arachnids are spiders. Arachnophobia is a fear of spiders and there is a horror movie by that name about vengeful giant spiders.
No, there is no Agrog in The Hobbit or The Lord of the Rings. There is a giant spider named Aragog in Harry Potter and the Chamber of Secrets.