Campaign Setup

Having played one game of the campaign, I figured I should write the setup and first battle report before moving on to the second. Being a mapless campaign with miniatures not painted with any historical force in mind, I suppose this will be a Imagi-Nation Campaign.

Somewhere on a largely fictional continent, many small streams flow out of a largely impassable mountain range and flow into a mighty river, ultimately reaching the sea in a protected harbor. The lower half of the river is held by the Red King.  The lower river valley is fertile and relatively flat, allowing for massive cash crop plantations and horse breeding farms.  Being a rich and largely agricultural kingdom, the Red King's army relies heavily on its cavalry.  The majority of the working class men are needed to ensure an abundant harvest. The Red Kingdom's army, in local custom, is made up of three columns of four units.
The first column, a cavalry column: 2x cavalry regiments, 1x artillery battery, and 1x dragoon regiment.
The second column, an infantry column: 2x regular foot regiments, 1x provincial militia, and 1x artillery battery.
The third column, an infantry column: 1x dragoon regiment, 2x regular foot regiments, and 1x provincial militia.

Upstream of the Red Kingdom's fertile fields lie the mountains, forests, and tributaries of the Kingdom of Five Rivers.  Although the main river carries the wealth of the upper kingdom to markets, the majority of the wealth comes from the higher elevations.  The Kingdom of Five Rivers was not always unified under a single dynasty.  Steep mountain cliffs isolate the upstream tributaries, leaving the people who live along the banks of the tributaries dependent on the rivers for transportation around the mountains and to other valleys.  The Army of the Five Rivers mirrors relative isolation of the tribes which settled on the upper tributaries.  Each of its columns retains some ties to the tribes from which it is drawn.
The first column, from a wealthy southern tribe: 1x cavalry contingent, 1x regular foot regiment, 1x citizen militia, and 1x artillery battery.
The second column, from a northern tribe: 1x cavalry contingent, 1x regular foot regiment, 1x citizen militia, and 1x artillery battery.
The third column, from highland rabble: 2x regular foot regiment and 2x irregular infantry contingents.

The Red Kingdom and the Kingdom of Five Rivers find themselves at war.  Several years ago, in an attempt to usher in a period of cooperation and mutual prosperity, the Crown Prince of the Five Rivers was married to The Red King's eldest daughter.  Shortly after ascending to his father's throne and before producing an heir, the young king was found dead in his palace.  The Council of Chiefs convened to determine the young king's successor. The council selected the deceased king's cousin, but the Red King believing his daughter to be the rightful ruler of the Five Rivers sent an envoy to convince the Council of Chiefs to install his daughter as queen.  On the deceased king's cousin's coronation day, the Red Army crossed its borders, prepared to install their princess as ruler of the Five Rivers, by force if necessary....