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Could be, but just from the photograph, the ditches look fairly recent and sharp without much sediment/infill. I can see a few zig-zags too and I wonder if perhaps they are not military training trenches from World War I. There are two quiet short stretches near me and they were dug by recruits before being sent to France. Dunno - just a thought. What are the lines going across the picture? Looks like a giant "noughts and crosses" grid.
Something is not right. This message is just to keep things from messing up down the road