I am reminded of a TimeTeam investigation of the Shooters Hill stop line from WWII, where there was a fougasse set up at the top of the hill to fire burning petrol down the hill on enemy tanks. I don't know what the reservoir for the petrol was like. I am wondering if this could be a tank for such a thing. I don't know the line of the stop line at the Medway - I assume there was one. And it was near the Engineers -sorry, repeating myself. See if Chattenden has any idea?

Penny