The Addington ministry realised they would face an inquiry over their false reasons for the military preparations, and during April unsuccessfully attempted to secure the support of William Pitt the Younger to shield them from damage. In the same month the ministry issued an ultimatum to France demanding the retention of Malta for at least ten years, the permanent acquisition of the island of Lampedusa from the Kingdom of Sicily, and the evacuation of Holland. They also offered to recognise French gains in Italy if they evacuated Switzerland and compensated the King of Sardinia for his territorial losses. France offered to place Malta in the hands of Russia to satisfy British concerns, pull out of Holland when Malta was evacuated, and form a convention to give satisfaction to Britain on other issues. The British falsely denied that Russia had made an offer and their ambassador left Paris. Desperate to avoid war, Bonaparte sent a secret offer where he agreed to let Britain retain Malta if France could occupy the Otranto peninsula in Naples. All efforts were futile and Britain declared war on 18 May 1803.