OK the towers part I have no idea The map in the original Serbian article should help you out though But I think I know what is confusing you There are 3 parts of the fort The foward back and the upper city The forward city is comprised of TWO parts the upper and the lower This upper part of the forward city is NOT the upper city Here Forward city the lowest X axis Upper part higher Z axis Lower part lower Z axis Back city higher than forward X axis Upper city higher completely at the back X axis That s how I m reading it and I m pretty sure I m right And if you look at the map tower 1 is in the upper city and it s what the word citadel is referring to Now the moat in the Serbian article the present tense is used jer je povezan sa Dunavom so the moat is still connected BUT the Danube is not filling it with water now koji ga je verovatno punio trns which probably filled it with water