What is "reverse fire"

Reverse \Re*verse"\, a. [OE. revers, OF. revers, L. reversus, p. p. of revertere. See Revert.]

1. Turned backward; having a contrary or opposite direction; hence; opposite or contrary in kind; as, the reverse order or method. ``A vice reverse unto this.''
   --Gower.

2. Turned upside down; greatly disturbed. [Obs.]

   He found the sea diverse With many a windy storm reverse.
   --Gower.

3. (Bot. & Zo["o]l.) Reversed; as, a reverse shell.

   Reverse bearing (Surv.), the bearing of a back station as observed from the station next in advance.

   Reverse curve (Railways), a curve like the letter S, formed of two curves bending in opposite directions.

   Reverse fire (Mil.), a fire in the rear.

   Reverse operation (Math.), an operation the steps of which are taken in a contrary order to that in which the same or similar steps are taken in another operation considered as direct; an operation in which that is sought which in another operation is given, and that given which in the other is sought; as, finding the length of a pendulum from its time of vibration is the reverse operation to finding the time of vibration from the length.