When is a truce not really a truce?

Do you really need to guess?

JERUSALEM - Israeli troops withdrew from the Gaza Strip as an unexpected truce took hold Sunday, but two major Palestinian militant groups, saying they had no intention of stopping their attacks, fired volleys of homemade rockets into Israel.

The rocket attacks by Hamas and Islamic Jihad tempered hopes for a lasting cease-fire, which was meant to end five months of deadly clashes.

What amazes me is that anyone expected otherwise.