WASHINGTON -- The minefields allied ground forces confronted on the offensive into Kuwait this week were penetrated with relative ease, using standard tactics and equipment.

U.S. officers said that the minefields were not as sophisticated as had been believed at first and that U.S. intelligence about their locations was good.

Mines remain a danger deeper in enemy territory, and hundreds of thousands of unexploded mines will probably cause lingering problems for years after the war is over. But the initial assault through the minefields went smoothly.

Whenever possible, the allies are seeking simply to skirt the minefields. But sometimes that is precisely why the fields have been set up: The way around leads through zones where artillery is set to pounce.