Here's an interesting application of interdicting the edges -- in this case the edges of the physical network -- rather than the node. Yahoo news reports:
RUTBAH, Iraq - U.S. Marines used to patrol the streets of this city near the volatile Syrian border. Now they've penned it in with a wall of sand, leaving only three ways in or out. ... The Marines ringed Rutbah with a 10.5-mile-long berm, seven feet high and 20 feet wide, in mid-January and reduced their presence to checkpoints at the three entrances that also are manned by a few dozen Iraqi soldiers. ...
The sand wall is only "an intermediate solution," said Marine Lt. Col. Robert Kosid, whose 1st Light Armored Reconnaissance Battalion is responsible for Rutbah and several thousand square miles of desert around it. "I think the long-term success of Rutbah involves a permanent presence in the city," said Kosid, who was also based here on his previous tour in Iraq. ...
Rutbah's streets are lined with impressive villas even though the town is devoid of natural resources and arable farmland. Its 20,000 people have thrived by taking a cut from smugglers moving goods along ancient routes that snake through Iraq from Jordan and Syria. ... "It's a more methodical way to use (checkpoints) to clear towns instead of going right in to sweep it," Sgt. Spencer Biegel of Albany, Ore., said as he helped inspect cars at a checkpoint. More than a dozen wanted suspects have been caught at Rutbah's checkpoints, he said. "In the long term it cuts down on Marine and civilian casualties," Biegel said.
Power has many definitions. One of the most important leaps of strategic intuition in history was some sailorman's realization that, contrary to the received wisdom of armies, bodies of water were not obstacles but roads. That intuition was taken to its logical conclusion by the exponents of Sea Power. They understood that power, to be useful, must be projected; and that without projection that power it was inert and useless. After Napoleon had swept the Continent with his brilliant victories, the Earl Saint Vincent, First Lord of the Admiralty, was asked if Napoleon could land in England. His answer is still remembered: they may hold the nodes, but they cannot traverse the edges. What he actually said was far more eloquent. "I do not say they cannot come, I only say they cannot come by sea." It was this constant inability to take the Ocean road which cheated the Man of Destiny of his prize. Destiny, it seemed, waited upon the whims of Sea Power. Mahan pronounced the classic judgment of how Napoleon was cheated of his fate: "Those far distant, storm-beaten ships upon which the Grand Army never looked, stood between it and the dominion of the world."
Regardless of who first saw the desert as a sea of sand, we must thank Winston Churchill for describing it so vividly. Looking upon the Sudan as a young man, he instantly grasped that the desert, like the sea, defied crossing.
This great tract, which may conveniently be called 'The Military Soudan,' stretches with apparent indefiniteness over the face of the continent. Level plains of smooth sand--a little rosier than buff, a little paler than salmon--are interrupted only by occasional peaks of rock--black, stark, and shapeless. Rainless storms dance tirelessly over the hot, crisp surface of the ground. The fine sand, driven by the wind, gathers into deep drifts, and silts among the dark rocks of the hills, exactly as snow hangs about an Alpine summit; only it is a fiery snow, such as might fall in hell.
It is this crossing which the Marines have chosen to hold as a temporary expedient against the day when the Iraqi government can take possession of Rutbah.