trench stick

noun1

1. •
   A type of baton or cane used by soldiers in military trenches, especially of the First World War, for manoeuvring and for basic combat.

   • Paid a visit to Sir Robert Garrett, whom I was glad to find looking just as well as in the old days when he used to trudge past my hut with his "trench-stick" in his hand. — 1859