During this period Imanuel N. Vesso was in charge of the congregation in Tanga town. S. Hjalmar Swanson, executive director of the Board of Foreign Missions of the Augustana Synod, visited Dar es Salaam in 1945 and was impresssed by Yakobo Lumwe, "The congregation was served by a venerable African from Tanga in the northern area, Pastor Jakobo, of whom a German wrote …'This Jakobo alone is worth a journey to Africa.´"[41] Yakobo Ng´ombe not only cared for his congregation in town but was also called to preach at other places such as Bagamoyo.
Kipindi hicho Imanuel N. Vesso alikuwa kiongozi wa Usharika wa Tanga mjini. S. Hjalmar Swanson, katibu kiongozi wa Shirika la Kurugenzi ya Missioni ya Kigeni la Sinodi ya Augustana, alitembelea Dar-es-Salaam 1945 na alivutiwa sana na Yakobo, "Usharika ulitumikiwa na mheshimiwa Mwafrika kutoka Tanga kwenye maeneo ya kaskazini, Mchungaji Jakobo, ambaye Mjerumani mmoja aliandika juu yake... 'Huyu Yakobo peke yake ni mwenye thamani kwa safari ya Afrika.'" [41] Yakobo Ng'ombe hakuangalia tu usharika wake katika mji lakini pia aliitwa kuhubiri katika sehemu zingine kama vile Bagamoyo. Kwa nyongeza alikuwa ni mwenye kazi nyingi akifundisha Dini ya Kikristo kwenye mashule ya serikali ya kienyeji.