the ruhr was a large industrial area of germany, close to the border of france and home to many coalfields. since germany would sometimes pay reparations in coal and goods, the ruhr was vital to germany. when, in december 1922, germany stopped paying reparations, the french army invaded the ruhr as retaliation, seizing goods and factories to make up for the lack of payment. germany could not respond with force, since their army was so weak, so they ordered workers to passively resist the french occupiers by going on strike. the french did not like this and arrested those who were unhelpful. eventually, the french brought in their own workers. overall, the french occupation of the ruhr caused major problems for germany, a key consequence being inflation due to shortages of goods. another was the printing of money, which only made prices rise further.