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Lego modified log bricks (Lego part number 30136) in reddish brown if laid sideways could look like sandbags but may look too uniform unless used here and there in small clusters to show areas of sandbags rather than WW1 style walls
I like that model a lot!
It's all good :-)
If you look at this example, its a mix of those palisade bricks, 2x2 Round bricks, 1x1 Round bricks and then the sandbag example above.
Hope some of that helps.