From the Israel Defense Forces' YouTube channel, here is a history of Hamas' escalation of violence and antagonism against Israel, including its program of radical Islamic indoctrination in the Gaza Strip. A juxtaposition of Hamas and IDF tactics starts at about 4:20.
The following video from October 29, 2007, shows a typical Hamas tactic: using civilians, particularly children, as human shields. Hamas terrorists used a UN-operated boys school to launch mortar attacks against Israeli civilians.
Visit the IDF's YouTube channel for more videos you won't see on CNN.