The 1916 Battle of the Ancre was a weeklong British offensive against German positions on the Ancre River in France. It was part of the first Battle of the Somme, and it was one of the first times a tank was filmed in battle.
That's because the Battle of the Ancre from Nov. 13-19, 1916, was one of the better-documented fights in the war. A film crew was on hand for much of the fighting and put together an over hour-long movie of their footage.
(Photo: Public Domain still from "The Battle of the Somme" film)
Unfortunately for the film crew and worse for the British soldiers, the rainy conditions made the terrain too muddy for the tanks and slowed down assaults by infantry, giving a huge advantage to the German defenders.