Kesselring wrote in his memoirs that he felt that he had been out-generalled when the Allies landed at Anzio. A few days before, he had told Jodl that he did not consider a mid-winter Allied amphibious operation likely. Admiral Wilhelm Canaris, the chief of the "Abwehr", the German military intelligence service, advised that it was out of the question for four to six weeks. Although taken by surprise, Kesselring moved rapidly to regain control of the situation, summoning "Generaloberst" Eberhard von Mackensen's Fourteenth Army headquarters and the 65th and 362nd Divisions from northern Italy, the 29th and 90th "Panzergrenadier" Divisions from the Cassino front, and the 26th "Panzer" Division from Tenth Army. OKW contributed some troops from other theatres, and by February Kesselring was able to take the offensive at Anzio. His forces were unable to crush the Allied beachhead, and in his memoirs Kesselring blamed himself, OKW and von Mackensen for avoidable errors.