Necropolis vs. Stronghold

The thing is, Craig Hack has a huge amount of attack and defense, and skeletons are easily defeated by his creatures. Also, how does one accumulate such a large number of skeletons in a short time? The Stronghold is based on the strength of its army (attack + defense), so how do you fight it?

As I understand it, this problem arises when Necromancers and Barbarians clash early on, when their primary skills are equal to the starting ones, and the army is correspondingly small. Then, of course, the Barbarians are more likely to win the battle. But, regardless of which town you are playing, it is important not to focus on just one tactic (skeletons, demons...), but to build up your strength depending on the specific situation. What dwellings, resources, and artifacts do you have, or are nearby? What should you take/build first? Spend your money on the army first, then on everything else. Don't rush into attacking neutrals if the losses in battle don't justify the experience gained or what they were guarding. And, of course, play more! Skill comes with experience!