On Tuesday, more than 2,600 workers at six different warehouses were on strike in Germany. Out of those six, four warehouses will experience strike action through Saturday. So far, Amazon has not announced any delays in the delivery of packages even with the strike. Nearly Amazon employs around 10,000 full-time employees in Germany with almost 10,000 more seasonal employees.
See "Amazon Workers in Germany Extend Strike", Reuters, December 17, 2014