This is a special miniseries on Vimy Ridge to celebrate 150 years of Permanent Artillery since the formation of A and B Batteries, Royal Canadian Artillery.

This episode looks at Flash Spotting, the work of Andrew McNaughton and the role of the CBSO.

We look at the development of the 'dark art' of artillery and in particular Counter Battery fires.

Check out the show notes for the podcast for all of the information that we cover in this episode as well as the images and other details that didn't make it into the podcast.