Ongoing topic with thoughts coming to mind from Jack Daniels whispers
1. "One should come to matters of war with special attention. It is not only who has more troops, provs, gold,friends or time. One should understand his weak and strong points, as those of his opponents. Knowing your limitation is half of plan. Knowing enemy limitations- is another half. Thus whenever possible try to observe on maps as many wars as possible and draw conclusion from them. With time you will see patterns that emerge from those observations. Matching your opponents skills to a known patterns is a great success, even greater if you know how to counter them. Thus I would advice to do a proxy wars against you intended opponents, without committing full power. Watch, analyze, learn and counter- that is a way of a warrior."
2. As such second topic comes to mind- how much troops send to war. I would advise against sending more than 10% to the proxy wars and more than 50-60% to a offensive war. If you cannot win with half and army then you can be sure that after you commit full force third party will emerge to reap the fruits of your war. In a process you too can lose. Do not wage offensive wars if you are not certain of victory with half of the force. Try to win quickly as enemy is closer to his offices,barracks and factories while your logistic lines are longer. Look for decisive battles with minimal losses to quickly dislodge enemy mech armies.
3. Defensive wars are another topic. In general they indicate you have less troops and resources. While in general you should keep mobile reserve of 30-40 % behind the lines, so you do not finish like Poland in 1939 squeezed by Germany and USSR. This reserve shows also your opponent that he cannot count on the quick victory. I would advise against big battles as you main goal is stalling enemy till he is not able to sustain war any more. You have factories, barracks in place while he has long logistic lines. His morale also goes down with time so there is no point to fight him in first 3-4 days. it does not mean you should not defend- you do not wat him to get possession of forts and factories so leaving garrisons of 10-20 troops in every town is a good way fo denying him of any infrastructure. At the same time you gather your newly produced troops for counter move when his armies will be weak on morale and low on reinforcements. You can be surprised how his power can go 30-40% down during 3-4 days of fighting. There is nor rush. Provinces are not so important as armies. With many provs and 0 armies you cannot continue fight, with 1 prov and many armies- you can still win. Keep it in mind before you go next time to a frontier battle and lose all troops against enemy who could be weaker in 3-4 days.
Post question below if you have any. If answers are not part of future divagations I will answer, otherwise I will ask you for patience.