Surging through the storm

American infantry troops fought off a desert attack by Iraqis on Tuesday, inflicting heavy casualties in a clash less than 100 miles from Baghdad. British forces battled for control of Basra, a city of 1.3 million sliding toward chaos.\nDefense officials said between 150 and 500 Iraqis were killed in the battle near An Najaf, adding there were no immediate reports of American casualties.\nIraqis launched their attack on a day of howling sandstorms -- weather bad enough to slow the U.S.-led drive toward the Iraqi capital. After the sandstorm lifted in Baghdad, pre-dawn explosions struck the city.\nWarplanes bombed targets in the northern part of the country and briefly knocked government television off the air in the capital. And U.S. troops in control of a vast Iraqi air base sealed 36 bunkers, designated as possible hiding places for weapons of mass destruction.\nAmerican officials also issued fresh cautions about the possible use of chemical weapons by Iraqi troops, although none has yet been used in the 6-day-old war -- or even found by the invading troops.\nAs the pace of combat quickened, American and British officials sought to prepare the public for something less than a quick campaign, and predicted difficult days to come.\nStill, President Bush forecast victory. "The Iraqi regime will be ended … and our world will be more secure and peaceful," he said after receiving a war update at the Pentagon.\nIraqi leader Saddam Hussein saw it differently. State television carried what it described as a message from him to tribal and clan leaders, saying, "Consider this to be the command of faith and jihad and fight them."\nIf confirmed, the initial reports of fighting near An Najaf would make it the biggest ground clash of the war, as well as the first encounter between advancing American infantry and the Iraqi units guarding the approach to Saddam's seat of power.\nA senior military official said the U.S. troops had hunkered down against a sandstorm when Iraqis -- either Republican Guard or paramilitary Iraqi troops traveling on foot -- opened fire with rocket-propelled grenades.\nSome of the 7th Cavalry's equipment was damaged in the attack, the official said.\nThe unit is part of the Army force driving on Baghdad. Some elements of the force are farther north, near Karbala, with only the Medina armored division of the Republican Guard between them and Baghdad. Muslim clerics in Iran warned against military threats to shrines in Iraq. An Najaf is the burial place of Imam Ali, son-in-law of the Prophet Mohammed.\nDetails of the situation inside the southern city of Basra, Iraq's second-largest, also were sketchy. British journalists reported that residents were staging an uprising against pro-Saddam forces and that Iraqi troops were firing mortars at them.\nBritish forces staged a raid on a suburb of the city, captured a senior leader of the ruling Baath party and killed 20 of his bodyguards.\n"He's sitting there in his little room thinking he's having a good morning and whap, we're in, whap, we're out," boasted Col. Chris Vernon, a British Army spokesman.\nThe Iraqis denied all of it. "The situation is stable," Information Minister Mohammed al-Sahhaf said in an interview with Al-Jazeera, an Arab satellite television network.\nUnited Nations Secretary-General Kofi Annan and others have warned of a possible humanitarian crisis in Basra. The International Red Cross said during the day that it had begun repairs at a war-damaged water-pumping station serving the city.\nAnnan told Bush's national security adviser, Condoleezza Rice, the United States is legally responsible for providing humanitarian aid to Iraqis in areas controlled by coalition forces. The United Nations cannot provide humanitarian assistance until security conditions allow the safe return of U.N. staff, Annan told Rice. White House spokesman Ari Fleischer blamed Saddam for slowing the flow of goods by placing mines near Umm Qasr.\nThus far in Operation Iraqi Freedom, Americans said they had taken nearly 4,000 Iraqi prisoners. There was no accurate death toll among Iraqi troops or civilians.\nAmerican losses ran to 20 dead and 14 captured or missing. The remains of the first two to die were flown overnight to Dover Air Force Base in Delaware.\nTwenty British troops had also died, including two killed Monday by friendly fire.\nThe U.S. Central Command, which oversees the war, announced the capture of an Iraqi military hospital used as a military staging area. Officials said Marines confiscated more than 200 weapons and stockpiles of ammunition and more than 3,000 chemical suits with masks, as well as Iraqi military uniforms. The Marines also found a T-55 tank on the compound.\nSecretary of State State Colin Powell predicted that the coalition eventually will find weapons of mass destruction, saying "there will come a time, when the enemy has been defeated, to make a more thorough search."\nElements of the U.S. 3rd Infantry Division were about 50 miles from Baghdad and hit Republican Guard units defending the Iraqi capital with an all-night artillery barrage.\nThousands of other troops hastened -- as much as the sandstorms would allow -- to join them for the coming battle against Saddam's seat of power.