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?

Context paragraphs:
Role-playing video game: A role-playing video game (commonly referred to as role-playing game or RPG, as well as computer role-playing game or CRPG) is a video game genre where the player controls the actions of a character (and/or several party members) immersed in some well-defined world.  Many role-playing video games have origins in tabletop role-playing games (Including "Dungeons & Dragons") and use much of the same , settings and game mechanics.  Other major similarities with pen-and-paper games include developed story-telling and narrative elements, player character development, complexity, as well as replayability and immersion.  The electronic medium removes the necessity for a gamemaster and increases combat resolution speed.  RPGs have evolved from simple text-based console-window games into visually rich 3D experiences.

Character race: In tabletop role-playing games, the character race represents the people to which a player character (PC) or a non-player character (NPC) belongs.  "People" is to be taken in the broader sense, and may encompass ethnic groups, species, nationality or social groups.

Bokosuka Wars: 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.

Hack and slash: Hack and slash, or hack and slay (H&S or HnS), refers to a type of gameplay that emphasizes combat.  The term "hack and slash" was originally used to describe a play style in tabletop role-playing games, carrying over from there to MUDs, MMORPGs, and role-playing video games.  In arcade/console-style action video games, the term has a different usage, specifically implying a focus on real-time combat with hand-to-hand weapons as opposed to guns or fists.  The term is often written in hyphenated form and with the conjunction contracted, e.g. hack-and-slash, hack 'n' slay.

Party (role-playing games): A party is a group of characters adventuring together in a role-playing game.  In tabletop role-playing, a party is composed of a group of players, occasionally with the addition of non-player character allies (sometimes called "henchmen") controlled by those players or by the gamemaster.  In computer games, the relationship between the party and the players varies considerably.  Online role-playing games or MMORPG parties are often, in the above sense, of the same constituency as tabletop parties, except that the allies are always controlled to a lesser or greater extent by the computer AI.  In single-player computer games, the player generally controls all party members to a varying degree.

Player character: A player character (also known as PC and playable character) is a fictional character in a role-playing or video game whose actions are directly controlled by a player of the game rather than the rules of the game.  The characters that are not controlled by a player are called non-player characters (NPCs).  The actions of non-player characters are typically handled by the game itself in video games, or according to rules followed by a gamemaster refereeing tabletop role-playing games.  The player character functions as a fictional, alternate body for the player controlling it.

Character sheet: A character sheet is a record of a player character in a role-playing game, including whatever details, notes, game statistics, and background information a player would need during a play session.  Character sheets can be found in use in both traditional and action role-playing games. Almost all roleplaying games make use of character sheets in some fashion; even "rules-light" systems and freeform role-playing games record character details in some manner.

History of live action role-playing games: Live action role-playing games, known as LARPs, are a form of role-playing game in which live players/actors assume roles as specific characters and play out a scenario in-character.  Technically, many childhood games may be thought of as simple LARPs, as they often involve the assumption of character roles.  However, the scope of this article concerns itself mainly with LARPing in a technical sense: the organized live-action role-playing games whose origins are closely related to the invention of tabletop role-playing games in America in the 1970s.

Hoplite: Hoplites were citizen-soldiers of Ancient Greek city-states who were primarily armed with spears and shields. Hoplite soldiers utilized the phalanx formation in order to be effective in war with fewer soldiers.  The hoplites were primarily represented by free citizens—propertied farmers and artisans—who were able to afford the bronze armour suit and weapons (estimated at a third to a half of its able-bodied adult male population).  Hoplites were not professional soldiers and often lacked sufficient military training.  Although some states did maintain a small elite professional unit, hoplite soldiers were relied on heavily and made up the bulk of ancient Greek armies of the time.

Experience point: 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.

Supporting paragraphs: Bokosuka Wars Experience point
Answer: experience point