Critical analysis of the new force was mixed; while the 601st had successfully repulsed the attack, it had lost two-thirds of its strength in the process, contributing to Major General George Patton's declaration that the concept was "unsuccessful in the conditions of the theater". McNair responded by further clarifying the role of the tank destroyer—it was to be a highly mobile force, which sought to find and occupy favorable positions to engage an oncoming enemy attack. A tank destroyer "need only to maneuver for a favorable position, conceal itself thoroughly and ambush the tank"—it was not intended to be used in a frontal offensive, or in assault in combat like a tank.