The Children's Pilgrimage by L.T. Meade

It was very late, in fact quite night, when Pericard returned. By this time the rats had come out in troops, and even Toby could scarcely keep them at bay. He barked, however, loudly, and ran about, and so kept them from absolutely attacking the children. By this, however, he exposed them to another danger, for his noise must soon have been heard in the street above, and it was well for them that the cellar in which they were hiding was not in the same house with Anton.

It was, as I said, quite late at night when Pericard arrived. He let himself in, not by the entrance through which he had come previously, but by the underground passage. He carried a dark lantern in one hand, and a neat little basket in the other. Never was knight of old more eagerly welcomed than was this French boy now by the poor little prisoners. They were all cold and hungry, and the rushing and scraping of the rats had filled their little hearts with most natural alarm.