One growing concern for Eisenhower and his planners was the likely reaction of local French political and military leaders toward an Allied invasion of North Africa. Strong French resistance could cause more casualties for the landing force. One issue coloring French attitudes was their deep-seated resentment toward the British for the Attack on Mers-el-Kébir in which the Royal Navy shelled the anchored French fleet in June 1940. Another issue was working with officials connected to the Vichy government which could cause serious political and security complications. Diplomat Robert D. Murphy, the U.S. consul general in Algiers, spearheaded efforts to gather pre-invasion intelligence and cultivate diplomatic contacts in French North Africa, and Wright would find himself intimately involved in his pre-invasion activities.