Question: What is a unit of measurement used in tabletop role-playing games to quantify a player character's progression through the game , used in the game that revolves around a leader who must lead an army in phalanx formation across a battlefield in real-time against overwhelming enemy forces while freeing and recruiting soldiers along the way?
Related documents: [0]  [DOC] Bokosuka Wars (ボコスカウォーズ ) is a 1983 action-strategy role-playing video game developed by Kōji Sumii (住井浩司) and released by ASCII for the Sharp X1 computer, followed by ports to the MSX, FM-7, NEC PC-6001, NEC PC-8801 and NEC PC-9801 computer platforms, as well as an altered version released for the Family Computer console and later the Virtual Console service. It revolves around a leader who must lead an army in phalanx formation across a battlefield in real-time against overwhelming enemy forces while freeing and recruiting soldiers along the way, with each unit able to gain experience and level up through battle. The player must make sure that the leader stays alive, until the army reaches the enemy castle to defeat the leader of the opposing forces. [END] 
[1]  [DOC] An experience point (often abbreviated to exp or XP) is a unit of measurement used in tabletop role-playing games (RPGs) and role-playing video games to quantify a player character's progression through the game. Experience points are generally awarded for the completion of quests, overcoming obstacles and opponents, and for successful role-playing. [END] 
Answer: 
experience point
experience point