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Is the fencepost attached to the wall? A big bolt could allow water to channel in and soak the mortar.
The footing is a potential culprit in itself, particularly as it abuts a concrete / cement path - it holds surface water against the brickwork, above the walls DPC (assuming there even is one).
It could be something internal too - if its a retrofit floor, it could have rubble and rubbish filling it, breaching any DPC.
NotThamesWater
Any thoughts on the likelihood of this hacked away damp proof course (to put the fence up) being the cause of this damp on the other side of the wall?