My strategy was to make attacks at a limited point and then build up fortifications, something that doesn't factor into the unit values. This build-up was started at the very beginning with the idea that
1. We will be able to reduce our attrition by ensuring that our infantry are under cover and are better protected against enemy artillery than being in the open.
2. That if the enemy has found an efficient collection of forces to conduct successful attacks that we can stop them on a minefield belt that is covered by our fires.
As it turned out that second part hasn't happened yet and seems unlikely to happen in the future. In any event we have fortifications throughout the depth of our line, which seemed to have bogged down the enemy assault last mission and helped to attrite them.
How things usually went for us was that we would be defensive for a turn, then attack the next turn, and then be defensive again until we could bring back our badly damaged vehicles. During the defensive phase we would further build up our fortifications in expectation of an enemy counter attack. In the last mission we were in that defensive cycle. Originally I had planned on a limited attack but decided against it as it became evident that Red was intending their own attack, and I guessed wrong as to the location of that attack. I don't know how the next Blue CO will do things, but that's generally how it went under my tenure. In any event, the trend from the first 5 missions have been positive as we've steadily gained ground despite fierce enemy resistance. I expect that trend to continue.