An attempted distributed-denial-of-service attack on Amazon.com by Anonymous, an online group that says it's in support of free speech on the Internet, appears to have failed.

The backers of WikiLeaks founder Julian Assange had plans to attack the online retailer's site Thursday morning, but "Amazon.com's famed EC2 infrastructure was more than a match for WikiLeaks allies."

Assange's online militiamen abandoned its attack on Amazon after about an hour without having any impact on the site.

"We don't have enough forces," Anonymous wrote in a post on Twitter.

The attempt on Amazon, which removed WikiLeaks from one of its servers and is now selling an eBook of the first 5,000 leaked State Department cables, is just the latest in a string of attacks the group has performed in what's being called a "hacking free-for-all."

The hackers have been targeting sites believed to be impending WikiLeaks' mission including MasterCard, Visa and PayPal, all of whom have denied users the ability to donate money to the anti-secrecy organization.

The group has also attacked Sen. Joseph Lieberman and former Alaska Gov. Sarah Palin's websites.

Though Amazon withstood the attack, others, like MasterCard, haven't had the strong internal network of the online retailer and have lost service for several hours. PayPal has denied any interruption to its service.

The hackers have not gone unaffected. The group's main site AnonOps.net has been attacked many times as well and was down as of Thursday afternoon.

Computer World reports: "According to Imperva, the hacker group is in the process of coordinating botnets with over 100,000 computers capable of generating 800MGBPS traffic to increase the attack horsepower."

Assange is currently in a London jail fighting charges of rape and other sex crimes, all of which he has denied.