This year, the group did more damage. Anonymous claims it took down 55 Israeli government sites. The number is really much closer to 38, as Vocativpointed out — a few of the sites on Anonymous’ list don’t actually exist.
The sites were taken down with DDoS attacks, a rudimentary technique that involves flooding servers with traffic, and doesn’t require real hacking skill. As of today, it appears that most of the sites have been restored and are fully operational again.