Division took heavy casualties trying to keep a corridor open, being reduced to brigade strength, but they succeeded; the 1st, 3rd, 4th and 42nd Divisions escaped along the corridor that day, as did about one-third of the French First Army. As the Allies fell back, they disabled their artillery and vehicles and destroyed their stores. On 27 May, the British fought back to the Dunkirk perimeter line. The Le Paradis massacre took place that day, when the 3rd SS Division Totenkopf machine-gunned 97 British and French prisoners near the La Bassée Canal. The British prisoners were from the 2nd Battalion, Royal Norfolk Regiment, part of the 4th Brigade of the 2nd Division. The SS men lined them up against the wall of a barn and shot them all; only two survived. Meanwhile, the Luftwaffe dropped bombs and leaflets on the Allied armies. The leaflets showed a map of the situation. They read, in English and French: "British soldiers! Look at the map: it gives your true situation! Your troops are entirely surrounded—stop fighting! Put down your arms!" To the land- and air-minded Germans, the sea seemed an impassable barrier, so they believed the Allies were surrounded; but the British saw the sea as a route to safety. Besides the Luftwaffes bombs, German heavy artillery (which had just come within range) also fired high-explosive shells into Dunkirk. By this time, over 1,000 civilians in the town had been killed. This bombardment continued until the evacuation was over. Battle of Wytschaete Gort had sent Lieutenant General Ronald Adam, commanding III Corps, ahead to build the defensive perimeter around Dunkirk; his corps command passed to Lieutenant General Sydney Rigby Wason from the GHQ staff. Lieutenant General Alan Brooke, commanding II Corps, was to conduct a holding action with the 3rd, 4th, 5th, and 50th Divisions along the Ypres-Comines canal as far as Yser, while the rest of the BEF fell back. The battle of Wytschaete, over the border in Belgium, was the toughest action Brooke faced in this role. On 26 May, the Germans made a reconnaissance in force against the British position. At mid-day on 27 May, they launched a full-scale attack with three divisions south of Ypres. A confused battle followed, where visibility was low because of forested or urban terrain and communications were poor because the British at that time used no radios below battalion level and the telephone wires