Juárez's government also faced international dangers. In view of the government's desperate financial straits, Juárez canceled repayments of interest on foreign loans taken out by the defeated conservatives. Spain, Britain and France, angry over unpaid Mexican debts, sent a joint expeditionary force that seized the Veracruz Customs House in December 1861. Spain and Britain soon withdrew. They realized that the French Emperor Napoleon III intended to overthrow the Juárez government and establish a Second Mexican Empire, with the support of remaining Conservatives. Thus began the French invasion in 1861 and the outbreak of an even longer war, with Liberals attempting to oust the foreign invaders and their Conservative allies and save the Republic.