Four merchant vessels sail in a line formation under command of the DDG-169 Wuhuan destroyer in the Gulf of Aden, January 6, 2009. [Xinhua]
![Four merchant vessels sail in a line formation under command of the DDG-169 Wuhuan destroyer in the Gulf of Aden, January 6, 2009. [Xinhua]](http://images.china.cn/attachement/jpg/site1007/20090109/000bcdb95f1d0ad12ea82a.jpg "Four merchant vessels sail in a line formation under command of the DDG-169 Wuhuan destroyer in the Gulf of Aden, January 6, 2009. [Xinhua]")