It felt like the war in Iraq had finally come to the north, when the 1,000 members of the US 173rd Airborne Brigade parachuted into a muddy airfield here on the western side of the Kurdish zone overnight Wednesday. The paratroopers were the most significant deployment of coalition troops in the north to date, part of an abbreviated northern front slowly taking shape. The US moved troops and equipment into the Kurdish-controlled zone all week, while air strikes pounded the Iraqi front and the key northern cities of Kirkuk and Mosul. "The northern front will be most important," predicted Hoshiar Zabari, spokesman for the Kurdish Democratic Party, whose troops control Harir. "If it opens from here, it leads directly to Saddam’s heartland, to Tikrit...from here you can get closer to Saddam’s strategic assets."