Unlimber

The gun he drove had been unlimbered near Horsell, in order to command the sand-pits, and its arrival had precipitated the action.

"I fancy," said Psmith, "that this is one of those moments when it is necessary for me to unlimber my Sherlock Holmes system. […] Do you follow me, Comrade Maloney?" / "That's right," said Billy Windsor. "Of course." / "Elementary, my dear Watson, elementary," murmured Psmith.

Bony jumped down and unlimbered his cramped muscles before going after his camels.