 Complete the following phrase:  The western Allies first went into action against the Panzerwerfer 42 after D-Day. American intelligence before D-Day pointed to the use of rocket launchers such as the Nebelwerfer by the German Wehrmacht, but they were unprepared for the effects of a mobile, armored, camouflaged, and highly destructive rocket launcher mounted on a half-track chassis. The British and Canadians were the first of the western Allies to see the German rocket launchers in action against troop concentrations and Allied positions. The 7th Werfer Brigade, made up of the 83rd and 84th Regiments, was sent to Normandy from Beauvais after D-Day, and on June 10 it was in Falaise; the next day, it was about 10 kilometers from Caen. The unit was part of the attack on the Orne Bridge, which was a British held position over the Orne River. The 84th Regiment of the brigade had fourteen combat ready Panzerwerfers, and the 83rd had about the same. Some other Werfer units were the 101st SS Werfer Abteilung, 101st Stellungs-Werfer Regiment, and the 102nd SS Werfer Abteilung, which was part of the 2nd SS Panzer Division Das Reich. The 7th Werfer Brigade fired 8,000 tons of ammunition, notably onto Hill 112 during 