In Book 18 of the Odyssey, what does Odysseus discover as he begins the testing of the women?

In Book 18 of the Odyssey, Odysseus
finds out that some of the servant women have been loyal to him and some of them have
them disloyal to him. Many of them are having sex with the suitors, which is a betrayal
to Odysseus and his family. Some of them have been disloyal to Penelope by trying to
find out her ploys and divulging information to the
suitors. 

Throughout the epic, Odysseus has been learning
about loyalty. It is one of the major themes of the entire work. Many people in Ithaca
are still loyal to him (including his swineherd Eumaios and his housekeeper Eurycleia),
even after his twenty year absence. They are rewarded with his return. The disloyal
people, like the servant girls who are sleeping with the enemy, are punished. In fact,
Odysseus has twelve of the women, who are proven to be disloyal, put to death by
hanging.