Tactics for the Stronghold.

If you upgrade bears and ogres, you can confidently go for level 131! 5 gray bears will do the trick there, and ogres are perfect as cannon fodder!
If you have angels or dryads, and expert shield/leather upgrades, you can even do it on the second week. A lot also depends on the pace of the game. Sometimes you can wait for level 131 and take it without losses, and sometimes you have to rush it on the second week because you might get killed on level 131.

Yes, the situations are probably different... I understand that bears are the most reliable 7th-level unit on the first week - it's harder not to get them than to get them:D, but it's not a given that they will be in your castle:smile30:, there can be different financial situations, and you might not be able to get a good buy on level 121 if you try to max everything out on the first week. And there are also options with secondary units: if you have one or two bird units or a native secondary unit from the first week, why not go for birds? Or 2-3 orc units, even though they are weak, they are still the only ranged units... The situation with wolves is generally confusing - they can be both a strong stack (if there are enough of them) and cannon fodder, and they are not very durable. Here's another question: when is it better to upgrade which units in the Citadel? Is it worth upgrading birds early? And what about wolves, if they are not the "THE" wolves? Bears, in my opinion, are very difficult to upgrade early: what if there are no crystals or dwarven mines?