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The photo was taken at 7.05 am on Wednesday, 25th of May, 2011, from the eastern outer moat wall. An earlier Rare view of St John's Tower, taken from near enough the same location but under different light conditions, was photographed at 11.32 am on Friday, 13th of May.
This unusual round tower effectively divides the Eastern Outer Curtain Wall (out-of-shot to the left) from the Western Outer Curtain Wall (on the far side of the tower).
The roof of a two-level caponier (alt. caponnier: fr. "chicken cage") to the right of St John's Tower connects it to the Ravelin (or Redan), a brick-lined structure, partially visible behind the trees near the right-hand edge, that had been added to the Spur by Colonel William Twiss of the Royal Engineers between 1801-1803 during the the Napoleonic Wars.

