The Portsmouth harbour boom of 1544 was the last defensive measure installed before the French fleet arrived in 1545. Combined with Southsea Castle, the Round Tower, and the Square Tower, the boom created a layered defence that prevented any enemy vessel from entering the main harbour. The 1545 battle was fought primarily in the Solent outside the boom rather than in the harbour itself, demonstrating the effectiveness of this final layer of defence.
None in 1544
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