South Sudan's army has retaken an eastern town captured by rebels two weeks ago, a military spokesman said on Monday, in a conflict that has uprooted thousands of people and hampered government plans to explore for oil. Army spokesman Philip Aguer said four soldiers and a dozen rebels were killed during a brief battle on Sunday to recapture Boma town in Jonglei state, where the government wants to search for oil with the help of France's Total. "The SPLA (army) restored order and control of Boma yesterday. I was there myself," Aguer told Reuters. But Peter Konyi Kubrin, a spokesman for rebels also known as the South Sudan Democratic Army, denied they had lost the town. Since winning independence from Sudan in 2011, South Sudan has been struggling to impose its authority across vast swathes of territory awash with weapons after decades of civil war with Khartoum ended in a peace deal in 2005. Rebel leader David Yau Yau, a former theology student, raised a rebe