Workers in the Unite union at Portsmouth International Port have voted unanimously for action short of a strike.
Port bosses plan to slash staff costs by 10 percent. Some workers could lose £1,300 a year.
The port is owned by Portsmouth council, and employs about 100 workers.
Strikers are demanding an unallocated €1.6 billion go towards workers' pay rise
London march on 27 October
Another day of mass resistance
Plus: 500 on Leeds unity march