A semaphore telegraph was placed on the roof of the church to enable rapid communication between Cologne and the Prussian capital of Berlin.
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From 1808 to 1814 Carleton Rode hosted a station in the shutter telegraph chain which connected the Admiralty in London to its naval ships in the port of Great Yarmouth.
The small square tower nestled in the south west corner of the fortress (number 7 on the plan above) is a remnant of the aerial telegraphy invented at the end of the 18th century by the engineer Claude Chappe (1763-1805), using semaphore signals.
From 1808 to 1814 Wreningham hosted a station in the shutter telegraph chain which connected the Admiralty in London to its naval ships in the port of Great Yarmouth.