Britain declared the war
The peace with Britain proved to be uneasy and controversial. Britain did not evacuate Malta as promised and protested against Bonaparte's annexation of Piedmont and his Act of Mediation, which established a new Swiss Confederation. Neither of these territories were covered by Amiens, but they inflamed tensions significantly. The dispute culminated in a declaration of war by Britain in May 1803; Napoleon responded by reassembling the invasion camp at Boulogne.