FYI, playing WRE campaign on H/H.
This point was already mentioned in a couple threads, but is important for WRE. In the mid to late game, you probably want your best army (or armies if you lucky) under the command of a loyal general (this fact applies even if they are the faction leader).
Alternatively, you can use captains only for full stack armies or switch generals frequently.
I'm not sure if my game is just extra hard, but I lost Spain not due to insufficient troops or money, but lack of loyalty. Twice my campaign army sent to Spain to recapture the provinces decided to mutiny. The final time, I sent a captain and took over the region and moved into France without problems.
That being said, the final army I sent was very experienced (retook Africa and defended against 2 hordes near Rome) and well equipped though still in the lower tier Roman units, so having a general would have been icing and not necessary to win battles.
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