Today’s exclusive story is bold and insightful GroundTruth.

Our correspondent in Pakistan, Shahan Mufti, has broken a news story that is a must read. Mufti knows Peshawar, Pakistan well. He’s been in and out of there and has great contacts on the ground in the rugged, ancient Silk Road town that lies near the border between Afghanistan and Pakistan. He was there covering the attacks on US military supply routes last month when he stumbled upon a market which is essentially a fencing operation for stolen US military equipment, including computers with restricted information. The theft of this property imperils the US troops in Afghanistan. And so he began to investigate.

We decided to send him into the market with a wad of cash to pose as a buyer. He was sold a US military laptop packed with sensitive information on US military equipment and logistics for about $650. He took photographs of the laptop and studied and in some cases photocopied the material that was on it. He then contacted the military attache at the US Embassy in Islamabad and eventually returned the laptop to its rightful owner: the US government.

The Pentagon tells us it is looking into how it was stolen, but clearly the military has a problem on its hands with a growing black market in Pakistan and Afghanistan for stolen US military goods. It’s supply routes are getting hit regularly. So America is learning what so many empires before it have learned: the Khyber Pass is the Achilles’ heel of armies that dare to invade a terrain as hostile and forbidding as the mountains that lie between Afghanistan and Pakistan.

Throughout the ages, from Genghis Kahn, to Alexander the Great, to the British and the Soviets and now the Americans, the lesson of Afghanistan is written in stone: This place is a graveyard for invading empires.