A soldier from Company B, 1st Battalion, of the Army's 23rd Infantry Regiment, talks with a man in west Baghdad's Ghazaliyah neighborhood while another soldier scans the perimeter. The men talked Thursday. Since February 14, U.S. forces in Iraq have been concentrating on tamping down the violence in Baghdad. However, in an ominous sign, large-scale sectarian and tribal warfare appears to be spreading outside of the capital, opening new fronts for U.S. and Iraqi forces already stretched thin by efforts to calm Baghdad.