In 1936 Gallina was promoted to major general for war merit; after the conquest of Ethiopia he remained in East Africa where he led counter-guerrilla operations, being decorated with an additional two Silver Medals of Military Valour. On April 4, 1939, he was promoted to lieutenant general and on September 13 of that year he assumed command of the troops of southern Libya. He was still there when the Italy entered World War II on 10 June 1940. On 6 July 1940, due to his vast African experience, despite his advanced age (66 years), he was placed in command of the Libyan Army Corps (1st and 2nd Libyan Division, "Maletti" Group), with which he participated in the Italian invasion of Egypt (9-16 September 1940). After the capture of Sidi Barrani was conquered (16 September), the 10th Army of General Mario Berti stood in defense.
