As U.S. agitators for war well knew Know , U.S. naval power would prove decisive , allowing Preventing_or_letting expeditionary forces to disembark Arriving in Cuba against a Spanish garrison already facing Perception_active nationwide Cuban insurgent attacks Attack and further wasted Expend_resource by yellow fever .

Frustrated Influence by the wasted effort , and with demands for action from their citizens , the allied force decided Deciding to attack Attack Russia 's main naval base in the Black Sea at Sevastopol on the Crimean peninsula .