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Operation Torch also served as a valuable training ground for Eisenhower's combat command skills; during the initial phase of Generalfeldmarschall Erwin Rommel's move into the Kasserine Pass, Eisenhower created some confusion in the ranks by some interference with the execution of battle plans by his subordinates. He also was initially indecisive in his removal of Lloyd Fredendall, commanding U.S. II Corps. He became more adroit in such matters in later campaigns. In February 1943, his authority was extended as commander of AFHQ across the Mediterranean basin to include the British Eighth Army, commanded by General Sir Bernard Montgomery. The Eighth Army had advanced across the Western Desert from the east and was ready for the start of the Tunisia Campaign. Eisenhower gained his fourth star and gave up command of ETOUSA to become commander of NATOUSA.

When did Eisenhower receive authority over the British Eighth Army?
February 1943