An armed confrontation between two Iraqi army units Friday left one soldier and one civilian dead, raising questions about the US-trained force's ability to maintain control at a time when sectarian and ethnic tensions are running high. The incident Friday near Duluiyah, about 70 kilometers north of Baghdad, illustrates the command and control problems facing the new Iraqi army, which the Americans hope can take over security in most of the country by the end of the year. It also shows that divisions within the military mirror those of Iraqi society at large. The trouble started when a roadside bomb struck an Iraqi army convoy, which police said was made up of Kurdish soldiers. Four soldiers were killed and three were wounded, police said. US military officials put the casualty figure at one dead and 12 wounded.