It would have been called a ditch. World War I was starting in 1914 and large ditches played a major part in the land warfare. The were called "Trenches" and the soldiers who occupied them described them as a grave with both ends kicked out.
Yes some called it the big ditch or Clinton's Ditch.
The ditch around a castle is called a moat.
I think its called a bunker
A deep ditch carved over time by running water is called a ravine.
Erie canal.
To Be Called For - 1914 was released on: USA: 2 September 1914
Called to the Front - 1914 was released on: UK: August 1914 USA: October 1914
EURIPUS
ditch
The ditches at the sides of a country road are called "cunetas." Singular: "cuneta." (culverts). Trench, irrigation ditch = zanja
They Called It 'Baby' - 1914 was released on: USA: 22 October 1914
It's called a moat.