After the return of Ethiopian emperor Haile Selassie to the throne an interim Anglo-Ethiopian agreement was negotiated in January 1942 for collaboration between the two allies. Great Britain sent civil advisers to assist Selassie with administrative duties and also provide him with military advisors to maintain internal security and to improve and modernize the Ethiopian army. The terms of this agreement confirmed Ethiopia's status as a sovereign state, although the Ogaden region, the border regions with French Somaliland, the Addis Ababa-Djibouti railroad, and the Haud (also known as the "Reserved Areas"), would remain temporarily under British control. Also the British assumed control over currency and foreign exchange as well as imports and exports.
A British-trained police force eventually replaced the former police who were in the service of local provincial governors. There were two revolts during this time; one in the Tigray Province; which was suppressed by British air missions, and the other in the Ogaden which was put down by two battalions of Ethiopian forces.
Meanwhile Selassie had made additional territorial demands; he desired the annexation of Eritrea and Italian Somaliland. These requests were ignored at this time by the British, who were in favor of a separate Eritrean entity, and wanted to combine Italian Somaliland with their colony of British Somaliland as a "Greater Somalia".
On 19 December 1944, a new Anglo-Ethiopian agreement was signed and Britain was given preferential status in regard to the appointment of advisers and management of the currency. The process of reversing the effects of World War II on Ethiopia did not completely end until 1954 when Ethiopia was restored to its internationally recognized borders of 1935 (pre-Italian occupation).