无掩护的侧翼
unprotected flank; unscreened flank

无掩护的前进
uncovered advance

无掩护的战斗前进
uncovered approach march

无掩护的接敌运动
uncovered movement to contact

无掩护的行军
uncovered march

无掩护的运动
uncovered movement

无掩护的运输队
unprotected column; unprotected convoy