To make the city harder to get to. This way, the dragon has to attack from the air and the archers can shoot him.
They wanted to prevent the dragon, Smaug, from being able to attack the town from the shore.
The strategy is that Smaug must attack from the air instead of from the ground, but his greatest strength is from the air, so this is counter intuitive.
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The bridges connected the town to the land. Without the bridges, Smaug could not land and attack the town, he had to do it from the air.
The men felt that the deserved it after killing the dragon
Smaug doesn't recognize the scent of Hobbit, although he knows what dwarves and men smell like.
It is a group of Men, Northmen, who settle on the Long Lake. Descendants of Dale also reside there.
The elves in "The Hobbit" did not know how the dwarves could have travelled there. They thought the barrels were all empty.
King of Rohan - Theodin, Aragorn, Legolas, Gimli and Theodin's army The army also includes Eomer, Theodin's nephew, who was banished from Rohan by Grima Wormtongue. It also included the the Elf Army led by Haldir.