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Tens of thousands of classified documents related to the Afghan war released without authorization by the group Wikileaks.org reveal in often excruciating detail the struggles U.S. troops have faced in battling an increasingly potent Taliban force and in working with Pakistani allies who also appear to be helping the Afghan insurgency.

The more than 91,000 classified documents -- most of which consist of low-level field reports -- represent one of the largest single disclosures of such information in U.S. history. Wikileaks gave the material to the New York Times, the British newspaper the Guardian and the German magazine Der Spiegel several weeks ago on the condition that they not be published before Sunday night, when the group released them publicly.