After conducting a thorough map review, I'm not loving the terrain or this battle.
A major obstacle noted in the briefing is the substantial marsh terrain on all approach routes. An additional obstacle is the need to knock out a railgun using only air assets at mission start. This is liable to be costly and will also mean no tactical air support is available for the initial and likely most difficult phase of the operation. Not ideal!
I expected all viable major roads to be heavily mined and for there to be bunkers of all types throughout. Recon cars are a natural counter to these tactics, but recon cars perform extremely poorly in difficult terrain and we do not have access to the M3 Scout Car, a halftrack much loved by Soviet razvedka units, or to Cavalry, a horse mounted infantry type that handles rough or marshy terrain with aplomb when well trained, properly shod and lightly laden.
However, a two key vulnerabilities exists in the enemy defensive layout. The first is that there are only four major supply sources on this map, the four primary objectives. Seizing the southwestern, northwestern and southeastern should, if I'm right about the number of bunkers on this map, disrupt enemy supply substantially and allow for a much easier capture of the center objective. The second is that there is only one airfield available to the enemy, and knocking it out promptly will at least in theory deny them any further air support. Airstrips may or may not be present on the map.
My initial plan of operations is to send 9th Mekh along the northnernmost intact bridge at Gross-Neuendorf, with 78 GRC on the bridge just south of that point at Keinitz. 9MC will advance with maximum speed into the enemy rear while 78 GRC secures its flank and fixes the enemy. This will allow me to seize two objectives with reasonable speed. Meanwhile 56 GRC will deploy at Goritz in the south, set up a defensive perimeter just beyond the bridgehead and advance to the objective.
Based on the allocation of available deployment slots this plan of attack is unexpected. Hopefully that means good things!
Naval infantry will be a precious resource during the marsh crossing portion of this map. I'll allocate one each to 56 and 78 GRC to ensure they have some ability to fight in the wetlands they need to cross.
luckily I had a save from turn 17 and just got it done now that I remember the objective.