American and European peace activists wrapped their arms around posts on a bridge over the Tigris River on Thursday, symbolizing their intent to act as human shields in any U.S. war on Iraq. The 14 activists, mostly from Italy, were one of the first groups here using the "shield" title, which suggests they might place their bodies at potential targets to deter bombing. But they acknowledged their mission was only a gesture meant to try to deter an invasion to topple Saddam Hussein.Katherina Soederholm, front right, a Norwegian, and other members of the 'human shield' group, which includes Americans, Britons,...