As a result, mobile tank destroyer forces generally operated in the same way as the separate tank battalion - being used as direct fire support for infantry operations across a broad front. But while tanks were effective in this role, the tank destroyers were handicapped by their open turrets and thin armor, making them more vulnerable to enemy fire. Moreover, the speed advantage that some tank destroyers had over tanks did not translate into a tactical advantage since such support operations moved at the speed of foot infantry. Infantry units did, however, appreciate the support of tank destroyers in lieu of available tanks.