Short answers, pulled from the story.
Benito Mussolini proclaimed the formation of Italian East Africa on the 9th of May 1936. This proclamation followed the Second Italo-Abyssinian War and combined Italian Eritrea and Italian Somaliland into a single administrative unit.
General Archibald Wavell was appointed General Officer Commanding-in-Chief of the new Middle East Command in mid-1939. He coordinated military operations with Admiral Andrew Cunningham and other commanders to defend Egypt and dominate the Mediterranean theatre.
Keren was captured early on the 27th of March after a battle lasting 53 days involving British and Commonwealth forces. The engagement resulted in significant casualties including 9,000 Ascari killed among Italian losses while Italians conducted a fighting withdrawal under air attack.
Mission 101 entered Gojjam province in August 1940 to coordinate activities of Ethiopian resistance groups known as Arbegnoch. Major Orde Wingate flew to Sakhala on the 20th of November to meet Colonel Daniel Sandford and drop supplies to raise Ethiopian morale.
Amedeo Duke of Aosta surrendered his troops on the 19th of May 1941 after being encircled by British forces. This event marked the end of organized resistance in East Africa except for small guerrilla groups that fought until the Armistice Cassibile in September 1943.