the 2nd Division's units were sent to the United Kingdom in August 1940, although the Iceland garrison remained in place until 31 October. The absence of the Mont Royals allowed Major-General Victor Odlum to reassign the Calgary Highlanders to the 5th Brigade in September, in an attempt to ethnically mix the brigades of the division. Training in the United Kingdom (1941) In 1941, the Toronto Scottish Regiment was transferred from the 1st Division to become the machine-gun battalion of the 2nd Division. Around the same time, the 8th Reconnaissance Regiment (14th Canadian Hussars) was raised from 2nd Division personnel supplemented by reinforcements from Canada. Due to equipment shortages, it was often difficult to adequately supply newly arrived divisions in England. Artillery units had to make use of outmoded 75 mm guns with steel tires, and a lack of anti-aircraft guns—diverted to civil defense during the height of the Battle of Britain—left Canadian units to fend for themselves with small arms. However, by February 1941, enough Bren guns had been issued to the infantry units and, by September, the artillery had been equipped with 25-pounder (84 mm, 3.3-in) howitzers, although signals equipment and transport were still lacking and anti-tank guns were dangerously scarce. When the division was not engaged in coastal-defence duties or unit training, formation-level training took the form of increasingly larger exercises. Exercise Waterloo, conducted from 14 to 16 June 1941, was the largest in the United Kingdom to date, with I Canadian Corps counter-attacking an imagined German sea and air landing. Exercise Bumper, held from 29 September to 3 October, was larger still, involving 250,000 men. These exercises tended to concentrate on traffic control, communications, and logistical concerns, and were of little practical value to the infantry. On 30 December 1941, the Calgary Highlanders introduced "battle drill" to the division. This new type of training emphasized small unit tactics as well as "hardening" training through use of live ammunition, slaughterhouse visits, and obstacle courses, and was adopted throughout Commonwealth forces stationed in Britain. Operation Jubilee (1942) 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. As a result, the 2nd Division was judged to be one of the