During the Pacific War, the Imperial Japanese Navy's strategy was fixated on the goal of luring the numerically-superior United States Pacific Fleet into a single decisive battle of annihilation, which would force the United States to sue for peace. That was at least partially the motivation behind the surprise attack on Pearl Harbor and the Battle of Midway but was loosely followed for as long as the IJN was capable of offensive operations. The goal was never achieved for several reasons. First, the US Navy was wary of committing all of its forces to one major battle. Further, the IJN concentrated so much of its efforts on preparing for a single massive showdown, which never truly occurred, that it neglected devoting resources towards protecting its naval supply lines, which soon fell prey to a Fabian strategy when they were extensively targeted by US submarines. Even Japanese victories such as the Battle of the Santa Cruz Islands failed to annihilate their opponents utterly. The hoped-for "decisive battle" against the US Navy never came, and the IJN was gradually ground down through attrition.