俄军喜欢预设两条防线，一条假的，一条真的。
假防线上的兵一遭到敌人进攻立即撤往真防线。 撤离假防线后产生的空地是事先炮火
瞄好的，是陷阱区。 敌人进入这个区域后，会被猛烈轰炸。
真防线的兵会反攻围歼进入陷阱区的敌人，敌人遭到打击后逃跑的路线也是由炮火预先
瞄好的，敌人在逃跑途中会被炮轰。
叙利亚叛军不熟悉俄军的这种战术，损失惨重。
What the Syrian forces have done is created two lines of defense. One is a
fake line that they fall back from immediately--before even suffering any
casualties. This fake line is in reality the target of their artillery. Once
the SAA have fallen back to the second line (the real line) they turn and
hold the enemy in position while their artillery rains down hell. Less than
a 1/3 of the artillery are focused on the kill zone, while the rest are
actually aimed at the most likely line of escape. http://www.liveleak.com/view?i=af0_1468385107
