敌火下撤退是一切军事行动中最困难和危险的。
Retreat under fire is the most difficult and perilous of all military operations.
如果在穿越危险地带时遭到敌火力打击，就要多用烟雾弹，用压制火力掩护穿越的队伍。
Note that if the group is under fire and crossing a danger area, smoke should be used extensively, and security for the crossing elements should be provided by suppression fires.
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