| No less than 6,000 regular troops were called into the city to quell the unrest, while strike spread through the whole sillon industriel. |
| Verviers was at the eastern end of the sillon industriel, the industrial backbone of Wallonia. |
| This region was emblematic of the whole Sillon industriel in Wallonia and of the Belgian general strikes which often broke out in the Borinage. |
| The city is part of the sillon industriel, the former industrial backbone of Wallonia. |
| It was also the nub of the controversy between Le Sillon and Pius X in the early 1900s, alas not discussed in the book. |
| It was to become an integral part of the sillon industriel, the industrial backbone of Wallonia. |
