On this site stood the old Government House of Portsmouth. It was on the visit of the Allied Sovereigns in 1814 that the Prince Regent, The Emporor of Russia, The King of Prussia, The Duke of Wellington, Marshal Blucher and Count Platoff, Helman of the Cossacks, surrounded by a host of Princes and Warriors, came forward on the balcony and drank to the prosperity of the British People.
 
This Mortar and Platform were here placed by Lieut-General Lord Frederick Fitzclarence, G.C.H., Lieut Governor of Portsmouth 1848, and restored by Lieut-General Henry Kent, late 77 Duke of Cambridge Own Regt. during the Lieut-Governorship of General Sir George Willis, K.C.B. 1889