Verzhak’s company is on the champion.

2 Wanderer

As an alternative, you could immediately build up a decent army so as not to lose in the shipyard.

The growth rate is too high; I would even say that there are more pirates added than soldiers in the dwellings. And since you need to fight two battles, it is better to eliminate one group of neutrals right away. This could work if you only had to fight once, but there is another problem. Because the growth rate of neutrals and soldiers in the dwellings is approximately the same, regardless of the army size, the losses after the first battle (time-army ratio) will also be approximately the same. That is, if you had 100 soldiers, you will be left with 25; if you had 1000, you will be left with 250. But since you also need to fight a second time, prolonging the first battle is not profitable, because it is better if, after the first battle, you have 25 soldiers left, and there are 150 pirates on the island, than if you have 250 soldiers left, and there are 1500 pirates on the island. If you prolong the first battle, it will take more time to replenish the army, and the Blue player is also developing. Moreover, if you delay too long, he may even come, and then you will have to fight him too (and he has Ogre Mages). Although I killed him a couple of times and leveled up the hero to level 7, after that, there were 1500 pirates on the island, and I was left without Berserkers after each battle. Well, I described the situation very approximately; try it yourself; this approach did not work for me.

This particular map in this Campaign has already been discussed on various forums.

I didn't really look for discussions; I entered the word Verzhak in the search here, and there were no results. Google also didn't give much, so I decided to post my version of the walkthrough here...