A level 3 analytical earthwork survey of the motte-and-bailey castle at Apple Dumpling bridge, Gosport was undertaken by Historic England in February and March 2020. Survey results confirmed that the earthworks represent a modified and spread motte with elements of an enclosing bailey surviving to the south and east. A Second World War pill box is built into the southern part of the bailey bank. The motte top would have had a diameter of about 14m originally if it was at its current height, but this would of course have been less if it was higher. Very little is known about the buildings and defensive structures on mottes but timber towers could have been substantial structures up to 15m high (Wyeth 2018, 147); excavations at Hen Domen and elsewhere have demonstrated just how complex, densely packed and frequently replaced buildings both on the motte and in the bailey could be (Barker and Higham 1982). The apparently simple earthwork remains of these small early castles mask considerable sophistication.