Americans were evacuated from the battle zones of Biafra Saturday as two tiny African armies fought in the rain in the Nigerian civil war. Unconfirmed reports indicated that federal troops had continued their advance into the secessionist state of Biafra, which had been the old Eastern Region of Nigeria before it seceded six weeks ago. The reports said that Ogaja, a key town in the northeastern corner of Biafra, had been captured and that the big university town of Nsukka in the northwest had been surrounded. Nsukka, by road, is 41 miles from Enugu, the capital of Biafra. The obvious federal plan is to capture Enugu and bring down its ruler, Lt. Col. C. Odumegwu Ojukwu. "Our orders are to get Ojukwu," a federal military spokesman said Saturday. "If we get him today, that's it..."

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