the key figures behind Italy's anti-partisan policies in Libya, such as poison gas and concentration camps, which resulted in the deaths of tens of thousands of civilians and have been described as genocidal. In 1929, De Bono was appointed Minister of Colonial Affairs, also referred to as the Minister of Colonies. In 1932, King Victor Emmanuel III and De Bono visited Eritrea. Second Italo-Ethiopian War In November 1932, at Benito Mussolini's request, De Bono wrote a plan for an invasion of Ethiopia. The plan outlined a traditional mode of penetration: a relatively-small force would move gradually southward from Eritrea, establish strong bases and then advance against increasingly weak and disorganised opponents. The invasion that De Bono envisioned would be cheap, easy, safe and slow. Mussolini separately involved the Army in planning, and over the next two years, the army developed its own massive campaign, which would involve five to six times the number of troops as required by De Bono. In 1934, Mussolini pulled the uncoordinated plans together into one that emphasized the military's idea of full-scale war. In 1935, De Bono became Supreme Commander of the Italian operation against Ethiopia during the Second Italo-Ethiopian War. De Bono was appointed because Mussolini wanted the victory in Ethiopia to be not just an Italian victory but also a fascist, hence the appointment of a well-known fascist general. In addition, he was Commander-in-Chief of the forces invading from Italian-held Eritrea on what was known as the "northern front". De Bono had under his direct command a force of nine army divisions in three corps: the Italian I Corps, the Italian II Corps and the Eritrean Corps. On 3 October, forces under De Bono's command crossed into Ethiopia from Eritrea. On 6 October his forces took Adowa, officially avenging the humiliating 1896 Italian defeat. Soon afterward, De Bono entered the historically-significant city of Axum and rode a white horse. After those initial triumphs, however, De Bono's advance slowed. On 8 November, the I Corps and the Eritrean Corps captured Mek'ele, which was to be the limit of Italian advances under De Bono. Increasing world pressure on Mussolini brought a need for fast glittering victories, and he was not prepared to hear of obstacles or delays. On 16 November, De Bono was promoted to Marshal of Italy (Maresciallo d'Italia), but Mussolini grew ever more impatient with the invasion's slow progress. In December, De Bono