The red Cadillacs were only a smoke screen for something else.
"It's no smoke screen," MacMaine said in a matter-of-fact tone.
“We arranged to put up a smoke screen,” Johnny whispered to Meggy.
At about 7.40 we turned, under cover of our smoke screen, and steered south-west.
In fact none of the British commanders realized what had taken place under cover of that smoke screen.