Short answers, pulled from the story.
The battle for Tug Argan began on the 11th of August 1940 when Italian artillery bombarded and attacked the west end of the Assa Hills. The campaign started after Mussolini declared war against Britain and France on the 10th of June 1940.
Lieutenant-General Archibald Wavell was appointed General Officer Commanding-in-Chief of Middle East Command in mid-1939 to oversee the region. Godwin-Austen informed Henry Wilson that further resistance at Tug Argan would be futile before ordering a withdrawal from the colony.
Ian Playfair wrote in 1954 that British forces suffered 260 casualties during the campaign while estimating Italian casualties at 2,052 men. He also recorded that seven British aircraft were shot down and ten were badly damaged in fourteen days fighting.
The Royal Navy commenced evacuating civilian and administrative officials from an all-tide jetty built near Berbera. Loading was complete by the early hours of the 18th of August before ships sailed for Aden.
Winston Churchill criticized Archibald Wavell for the loss of British Somaliland because few casualties occurred so he thought the colony had not been vigorously defended. Churchill proposed a board of inquiry but Wavell refused to co-operate with the investigation.