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CAIRO – Demonstrators burned cars and barricaded themselves with barbed wire in Cairo's central Tahrir Square, demanding the resignation of the military's chief Saturday hours after troops violently dispersed a protest there, killing at least one and injuring 71.In the pre-dawn raid on the square, hundreds of soldiers beat protesters with clubs and fired into the air in the square, highlighting the rising tensions between protesters and the military leaders whom they praised in Tahrir two months ago when President Hosni Mubarak fell from power.Several thousand protesters, some armed with sticks and other makeshift weapons, had moved back into the square by Saturday afternoon. They vowed not to leave until the defense minister, Field Marshal Mohammed Hussein Tantawi, resigns. Tantawi, a Mubarak appointee, leads the Supreme Council of the Armed Forces, which rules Egypt now and is made up of the military's top generals.The confrontation could mark a key juncture in Egypt's upheaval. For weeks, protest leaders have been critical of the military's handling of the post-Mubarak transition and sought to pressure it to change, but both sides also worked to stay on good terms. Now the overnight clashes resembled the ugliest moments of the 18-day protest movement against Mubarak — with authorities cracking down violence and protesters chanting for the leader's removal.Soldiers backed with a line of armored vehicles swept into the square around 3 a.m., firing continual barrages into the air with automatic weapons to intimidate protesters camped out in the center of Tahrir. The troops waded into the tent camp, where protesters had formed a human cordon to protect several army officers who had joined their demonstration in defiance of their superiors.Witnesses reported two killed. Ali Mustafa, a car mechanic who was guarding the "free soldiers" tent, said he saw an attacking soldier stab one of the officers to death with his bayonet. He pointed to a section of pavement stained with blood under a small pile of garbage and food remains.Another protester was shot dead, said Ahmed Gamal, who was there overnight and said he helped carry away the body. He added that he saw at least two others severely injured by live ammunition. The deaths could not be confirmed