In September 1940, Wavell ordered the commanders in Sudan and Kenya to make limited attacks once the rainy season had ended. On the northern front, Platt was to attack Gallabat and the vicinity; on the southern front, Cunningham was to advance northwards from Kenya through Italian Somaliland into Ethiopia. In early November 1940, Cunningham had taken over the East African Force from Major-General Douglas Dickinson, who was in poor health. While Platt advanced from the north and Cunningham from the south, Wavell planned for a third force to be landed in British Somaliland by amphibious assault to re-take the colony, prior to advancing into Ethiopia. The three forces were to rendezvous at Addis Ababa. The conquest of the AOI would remove the land threat to supplies and reinforcements coming from Australia, New Zealand, India, South Africa and British East Africa via the Suez Canal for the Western Desert campaign and re-open the land route from Cape Town to Cairo.