KAMPALA, Oct 20 (Reuters) - Eleven officers from Uganda's Lord's Resistance Army rebel group have surrendered to south Sudanese authorities after fleeing a battle between their two top commanders, the Ugandan army said on Saturday. Army spokesman Felix Kulayigye said he had reports from South Sudanese authorities and his defence minister, who was with them in its capital Juba, that the officers had fled LRA hideouts in east Congo to Sudan after a shootout on Wednesday.