British Armoured formations of World War II In April 1939, the Mobile Division was renamed the 1st Armoured Division and the Mobile Division (Egypt) was named the Armoured Division (Egypt) on the outbreak of war, before being renamed the 7th Armoured Division on 16 February 1940. Following the outbreak of war, the headquarters of the 2nd Armoured Division was activated on 15 December 1939. The first troops, however, were only attached to the division in the following month and then in part from forces released from the 1st Armoured Division following a divisional reorganisation. During 1940, a further three armoured divisions were formed; the 6th Armoured Division
7th Panzer Division (Wehrmacht) to the west and 7th Panzer Division to the east, flanked by the SS Division Totenkopf. The following day the British launched a counterattack, deploying two infantry battalions supported by heavily armoured Matilda Mk I and Matilda II tanks in the Battle of Arras. The German 37 mm anti-tank gun proved ineffective against the heavily armoured Matildas. The 25th Panzer Regiment and a battery of anti-aircraft guns were called in to support, and the British withdrew. On 24 May, Hitler issued a halt order. The reason for this decision is still a matter of debate. He may have overestimated the