Summary: Pakistan’s shutting of a key supply line for coalition troops in Afghanistan and the apparent ease with which militants are attacking the stranded convoys are shaking an already uncomfortable relationship between Washington and Islamabad. … One-year retrospective: One year ago today, on October 4, 2009, Aubrey Immelman reported that hundreds of insurgents armed with automatic rifles and rocket-propelled grenades nearly overran a U.S. outpost near the Afghanistan-Pakistan border, killing eight U.S. soldiers and capturing more than 20 Afghan security forces in the deadliest assault against U.S. troops in more than a year.