The thing to do is one flap to get you to the neck of a bottom pipe then another flap to get you through the gap between the pipes but before all of that you might want to have a flap to adjust your height.
To get a lot of enemy soldiers killed easily go to custom battle then pick short map, disable all unit types except MG, choose 2 trenches, 4 wire and no mines, set difficulty to easy, AI to aggressive and you play as Germany. Get 3 MG units and when a British attack fails take their trench and stay there. Fill your own trench with MG units in case you need to replace your men who are in the British trench.
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