 Complete the following phrase:  The German column from Kitanda reached Songea early in the morning on 12 November 1916, and unsuccessfully attempted a frontal assault on the well-entrenched Rhodesian positions. After the German column from Likuyu arrived in the afternoon, the Germans laid siege to Songea for 12 days before retreating towards Likuyu on the 24th. The Rhodesians were relieved the following day by a South African unit. The RNR then moved back to Litruchi, on the other side of Lake Nyasa, from where they sailed to the German East African town of Mwaya, where they were reunited with the RNR contingent that had gone to Buhora. This second column had ambushed a group of Germans, who were moving towards Northern Rhodesia with a naval gun salvaged from which had been sunk at 