World War One: How tanks helped win final victory
19 June 2014 Last updated at 12:39 BST
Tanks were introduced into the battlefield in 1916.
Their development was a response to the stalemate that trench warfare created on the Western Front.
BBC Radio Wales programme Good Morning Wales has been looking at how roles crucial to Army operations now were developed during World War One.
Serving soldier L/CPl Thomas Warner from 1st The Queen's Dragoon Guards has been finding out more, as part of a series of reports by Charlotte Dubenskij.