Most uses of rustle seem full of danger and adventure in The Hobbit, but the mention in Chapter 2 is comical:

[02.039] …and do what they could they made a deal of rustling and crackling and creaking (and a good deal of grumbling and dratting), as they went through the trees in the pitch dark

• 02.039 they made a deal of rustling
• 08.037 A few leaves came rustling down
• 12.008 hear the rustle of the whispering voices of the others just outside.
• 13.001 and rustled in the tunnel.
• 14.040 Leaves rustled