Pausanias Description of Greece 4.21.1

[1]
  His story seemed to be reliable, and he led the way for Emperamus and the Spartans. Their march was difficult, as it was dark and the rain never ceased. Nevertheless they accomplished it in their eagerness, and arriving before the acropolis of Eira, mounted by raising ladders and in any other way that was possible. Various indications of the trouble that was upon them were given to the Messenians, especially by the dogs barking, not in their usual fashion, but uttering more loud and continuous howls. realizing that the supreme and most desperate crisis had come upon them, they did not wait to collect all their arms but snatched whatever lay ready to the hand of each, to defend the fatherland that alone was left to them of all Messenia .