History of the Peloponnesian War

After this, the Peloponnesians, seeing that their engines were doing no good and that the counter-wall was keeping pace with the mound, and concluding that it was impracticable without more formidable means of attack to take the city, began to make preparations for throwing a wall about it.

But before doing that they decided to try fire, in the hope that, if a wind should spring up, they might be able to set the city on fire, as it was not large; indeed, there was no expedient they did not consider, that they might if possible reduce the city without the expense of a siege.