In early 1942, under Major General J. H. Roberts, the 2nd Canadian Infantry Division participated in several additional full-scale combat exercises, again gauging the ability of Commonwealth divisions to repel a possible German invasion. As April and May progressed, the exercises intensified, becoming significantly more demanding on the participants.[19] As a result, the 2nd Division was judged to be one of the four best divisions in the United Kingdom, and was selected as the primary force for the upcoming Allied attack on the German-occupied port of Dieppe—codenamed Operation Jubilee. Mounted as a test of whether or not such a landing was feasible, the Dieppe raid was to be undertaken by the 4th and 6th Brigades, with additional naval, air, and infantry support. Significant elements of the 5th Brigade were also involved.