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Figure 17: Inner Saxon ditch. Section 1, Area 1
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Period 1 - The inner ditch, cleaned out on more than one occasion, and filled with stones in period 3A. This is cut on its northern edge (left) by the ditch of period 4.
Period 2 - Ditch probably cleaned out in periods 2A and 2C
Period 3 - The ditch has been filled with large stones and some mortar from the destruction of the wall, period 3. The interstices have become filled with earthy clay erosion products , and subsequently covered by a soil layer  after the abandonment of the defences (period 3B).
Period 4 - The period 3 fill of the ditch is cut on its northern edge (left) by the ditch of period 4.
Compare sections in similar positions in Figs 23, 32, 35.