Workers at the retail giant Argos are beginning a three-week strike in a dispute over redundancy arrangements.
Protests will be staged outside a distribution site in Burton-on-Trent.
The Unite union, which represents Argos distribution workers, has warned that deliveries to customers will be severely hit.
Unite has accused Argos of failing to give guarantees at all its logistics sites that workers' future terms and conditions will be safeguarded
Almost 500 workers were transferred from Argos' Lutterworth distribution hub in Leicestershire to Wincanton Logistics in Kettering, Northamptonshire.
A spokesman for Argos said the company was "disappointed" with the actions taken by Unite.