With the help of the natives, he built schools and mission stations and mediated in an impasse that could have resulted in two wars. He baptised so many natives that there was no one willing to succeed the old fetish priest after the shaman died. Hall went many settlements such as Buem in 1891 and preached in many villages including Jasikan, Worawora, Guaman and Boradaa. Together, with his fellow second generation West Indian colleague, Nicholas Timothy Clerk, Peter Hall went to Adele and Salaga in the Northern Territories. He undertook another journey to Adele and Akebu with the Rev. P. H. Roesler who was a Basel missionary stationed at Aburi. He was transferred to Tutu in 1902, where he enjoyed great tranquility for three years. After interceding in prayer for the paramount chief, Nana Akuffo, the locals accused him of meddling in a land dispute between the natives and the church. With tensions brewing, the Basel missionaries, the Rev. Samson and Dr. Fisch had to step in as mediators to settle the disagreement. However, there was so much resentment that the many new converts boycotted church services. The chapel was closed one Sunday and he went to preach at Obosomase. He was temporarily transferred to Larteh but had to return to Tutu as his family was being intimidated by the townsfolk. Traders refused to sell to his family. Someone fired a gun into their compound while a trader who had sold palm nuts to his wife returned to forcibly take them while they were boiling in a pot in their yard. In January 1908, he was transferred to Adawso were natives were so receptive, he begged the church management to stay on when his tenure ended after five years. In February 1913, Peter Hall returned to Akropong, where his new colleagues mostly consisted of German missionaries. During World War I, the British colonial government expelled the Basel missionaries in 1917 as "“alien security risk”" on Gold Coast as many were of German and Swiss German heritage. This new development provided an opportunities for African members of the Basel Mission to take more administrative responsibility even though they had no prior experience in management. The Scottish mission of the Free Church of Scotland led by the Rev. A. W. Wilkie took over the mission's work in evangelism and education. The Scottish mission was then operating in nearby Nigeria. The Presbyterian Scots decided to reorganize the church hierarchy and structure. A conference, the first Synod of the church was organised at Akropong.