Upon her return to Gibraltar, "Seraph" was assigned to Operation Flagpole, the carrying of General Dwight Eisenhower's deputy, Lieutenant General Mark W. Clark, to North Africa for secret negotiations with Vichy French officers. Loaded with collapsible canoes, submachine guns, walkie-talkies, and other supplies, the submarine carried Clark, two other United States Army generals, United States Navy Captain Jerauld Wright, several other officers, and three members of the British Special Boat Section - Captain G.B. ('Gruff') Courtney; and Lieutenants R.P. Livingstone and J.P. Foot.