$ sudo apt-get update
$ sudo apt-get install crossfire-maps-small 

crossfire-maps-small is installed in your system.

Make ensure the crossfire-maps-small package were installed using the commands given below,

$ sudo dpkg-query -l | grep crossfire-maps-small *

You will get with crossfire-maps-small package name, version, architecture and description in a table

crossfire-maps-small package basic information: