Jagged Alliance is a turn-based type strategy game, where the player takes the command of a mercenary team, and fights to fullfill many different missions. Jagged Alliance covers other aspects of mercenary life too - organizing the action, finding the mercenaries, finances. JA quickly became very popular all over the world. The sequel and a few mission packs were released, too.
This tileset addon pack is not currently in the 1.13 release. (May be officially added soon). It allows support of maps made with the tilesets from Unfinished...