Eastern Regional Corps

Eastern Regional Corps is the kingdom's army located in the eastern region of Rinse Kingdom. While the Corps and Troops under the Eastern Regional Corps generally subjugate monsters, their main aim is to guard the eastern borders of the kingdom against the neighboring Istel Kingdom.

Previous Timeline
Due to the incompetent Viscount Benjamin Doyle being in the position of Supreme Commander the entire regional corps suffered defeat after defeat and thousands of soldiers lost their life. Moreover, the entire eastern region of Rinse Kingdom was pillaged and decimated by the Istel Kingdom's Western Regional Corps.

Current Timeline
As Roan was able to employ countermeasures against Istel Kingdom's invasion the situation was not as dire as in his previous life. With the 5th and 7th Corps in the lead, the advance army of Istel Kingdom was defeated due to ingenious ambushes and counter-night raids. However, due to Benjamin Doyle's cowardly nature, he positioned the regional corps far from the border which allowed the Istel army to gain a foothold despite the early losses. Afterwards, the regional corps faced over 20 defeats despite the home ground and advantageous terrain. If not for the efforts of the 7th Corps in finding and destroying the supply lines and supply storage of the Istel Kingdom, the war would have certainly lasted much longer and the Eastern Regional Corps would have suffered much more damage.

Benjamin Doyle, being a petty person, ordered the 6th and 7th Corps to chase the already retreating Istel army which led to the two corps into falling in Peid Neil's trap and being wiped out with the exception of Aaron Tate. Count Io Lancephil obtained a dishonorary discharge letter for Benjamin Doyle with the basis being his absolutely pathetic performance as the Supreme Commander.

After Roan suppressed the rebel Baron Elton Coat, for his reward, he recommended Aaron Tate as the one to fill the empty position of Eastern Regional Corps' Supreme Commander. The nobles agreed to the appointment after both Prince Kallum Rinse and Prince Tommy Rinse's factions put one of their nobles as the Vice-Regional Corps Commander.