Background
The first 'Engev' (Emperor of Lazaeron) sees a need to unite the entire planet to defend against an alien threat, only he knows of this threat and he has no way to definitively prove this, specifics arent important to the question. He has resolved to bring all nations of the planet Laznolara under one banner either through diplomacy or conquest, Lazaeron is supposed to be the most powerful nation in the world both politically and militarily. This is a light-steampunk setting with technology comparable to mid 1800s Europe. Further information on the specifics of this world are detailed in the highlighted answer to this question (thanks DWKraus!). TL;DR Winters get very cold so during the winter the population congregates in massive cities, come early spring there is huge mobilization as large trains transport workers and massive amounts of military units to the frontier regions as they scramble for resource hubs.
I would like to know if there are any glaring issues with the structuring of this military given the information I have provided. And, if possible, give some advice on changes that could be made to make this a powerful fighting force.
Below is the ranking structure of the 'Ile-Raed', the Lazaeron Grand Army. I have included the rank name in this worlds language followed by a rough equivalent commonly used in our world, then a brief (or not so brief) description of their duties.
Please let me know if you have any additional questions or recommended edits, this is a big question so I am bound to have made errors here and there.
- Represents an atypical rank responsible for duties outside what a soldier is usually expected to perform.
Pre-Rank Fresh recruits or conscripts are given the rank of Jæwutkæ (low or under soldier) during introductory training.
Enlisted Ranks, Bykiz
Wutkæ, literally "Soldier", rank and file line infantry.
Tunzowutkæ, Oversoldier, Soldier who has distinguished himself as a reliable figure, assigned special duties by NCOs, example figures for the Wutkæ.
Non-Commissioned Officers, Wutkæ Vybab
Zazæ, Sergeant, First rank of authority, squad/section leader as designated by the Livi Zazæ or if Livi Zazæ is unavailable
*Raedkunok Zazæ, Artillery sergeant, responsible relaying orders to his individual gun crew. Can also give direct orders to his gun if he is not part of a battery (rare).
Livi Zazæ, Chief Sergeant, Squad/section leader, enforces standards and keeps squad in fighting condition
Officer Cadets, Engtad Vybab
Officer Cadets are officers in training or officer candidates, they typically act as observers in combat zones or accompany Officers in addition to their usual duties as NCOs. Duties of officer cadets vary widely and there is no set standard. Wears a white stripe on their shoulder in addition to normal rank crest.
Officers, Vybab
Dyt Lanæt, Second Lieutenant, Platoon leader, keeps platoon in fighting condition, cares for 'hands on' matters in the platoon; 1 per platoon.
Lanaet, First Lieutenant, Platoon leader/overseer, advisor to the Company commander, responsible for writing reports for platoon. Number per company varies based on unit size, 1 per platoon.
Livi Lanaet, 'Chief Lieutenant' (Captain), Leads company in combat, responsible for unit cohesion and discipline, carries out orders from the company commander, second in command of the company. 2-3 per company.
*Ħot Vybab, Staff Officer, Compiles reports from company and presents them to company commander, generally assists company commander in administrative duties; specializations exist for this role (e.g. some focus purely on logistical matters). Experienced Staff Officers can also be assigned to battalion commanders to assist in administrative duties. Number per company varies based on the work load of the Commander.
Engutayodang, 'Commander' (Major), Company Commander, responsible for interpreting orders and executive matters in the company. 1 per company. In the Lazaeron Army 'Commander' is technically the highest officer rank, succeeded by Generals in authority. Senior Officers in command of Battalions and Brigades are commanded by what are colloquially known as 'Battalion' or 'Brigade' Commanders and are technically the same rank as Company Commanders. Seniority not only in the Army but also in Laznolaran culture is based on age and experience, young Commanders are left in charge of the company and after several years are given the opportunity to move up the ladder to command Battalions and Brigades although rank technically does not increase. This can lead to frustrating situations where truly talented young officers are tied down to the company level for much of their careers due to the difference in age with their seniors. Chain of command between Commanders is enforced by this cultural reverence for elders. Battalion and Division Commanders wear a red or purple stripe on their shoulder respectively in addition to their rank crest.
Zæsh-Rûbæb, 'Bronze General' (1-star General), Division Commander
Zæsh-Rûbtûfla, 'Silver General' (2-star Genrel), Army Commander
Zæsh-Zinoa, 'Gold General' (3-star General), Army Group Commander
Zæsh-Kuref, 'Arch-General' (4-star General), Overall Commander of the Army
Engev, 'Emperor of Lazæron and Chief Agent of Laznolara', Decides where war will happen, usually leaves commanding of the Army to the Generals. The Engev may have been a General himself before being elected.
Unit Sizes
Observe how unit sizes, up to the battalion level, are directly associated with how many men can be fitted on a train, for example one platoon is equal to one standard size passenger train car carrying 50 men and their individual equipment. This was considered very important for maintaining unit cohesion during the, often chaotic, early spring mobilization period. One platoon was able to operate independently toward a mission objective immediately after departing from its car until it was able to reattach with its parent force.
Squad/Section: 10/25 men
Platoon: 50 men, one outfitted platoon per passenger car.
Company: 100-350 men, contains organic fire support assets, 100 is considered a reduced company. A company is the smallest unit in the Ile-Ræd that can be considered independent.
Battalion: 2-10 companies, organic company train for transportation of men and equipment, typically no more than 1,500 men.
Brigade: 2-5 Battalions
Division: 4 Brigades, assigned to defend specific frontier tract in spring dictated by Army Commander.
Army: 2 or more Divisions, assigned to one frontier sector.
Army Group: 2 or more armies, assigned to theater or partial theater for major military actions.
Tûnzo Army: (lit. 'Over Army') Entire armed forces as commanded by Arch-General, varies in size