“Back to the Mountain!” cried the dwarves as if they had not heard him, so back he had to go with them. As you have heard some of the events already, you will see that the dwarves still had some days before them. They explored the caverns once more, and found, as they expected, that only the Front Gate remained open; all the other gates (except, of course, the small secret door) had long ago been broken and blocked by Smaug, and no sign of them remained. So now they began to labour hard in fortifying the main entrance, and in remaking the road that led from it. Tools were to be found in plenty that the miners and quarriers and builders of old had used; and at such work the dwarves were still very skilled.
As they worked (пока они работали) the ravens brought them constant tidings (вороны постоянно приносили им известия). In this way they learned (таким образом они узнали;
constant [ˈkɔnstǝnt] learn [lǝ: n] guide [ɡaɪd]
As they worked the ravens brought them constant tidings. In this way they learned that the Elvenking had turned aside to the Lake, and they still had a breathing space. Better still, they heard that three of their ponies had escaped and were wandering wild far down the banks of the Running River, not far from where the rest of their stores had been left. So while the others went on with their work, Fili and Kili were sent, guided by a raven, to find the ponies and bring back all they could.