With that strategy in mind the choice of henchmen was obvious

For the most part, this was not really too big a deal. For the ground troops the henchmen worked Airrivals Spi out great but when it came to the two guards in the tower it was ridiculous. They were really hard to hit.

Only I, playing as a ranger, could hit them and not even consistently so interrupts were ineffectual. To make matters worse they could heal. I literally, after about 15 minutes, walked away from the computer for a while in the hopes that perhaps I would get lucky and come back with one of the guards dead.

After coming back, I realized that luck was just not on my side so I quit the mission, and came back this time with the ranger henchman. This made all the difference in the world.

See the strategy here was to take out the towers. With that strategy in mind the choice of henchmen was obvious.

Taking another idea from chess that will help. Try having a goal. In chess, we think of it as imagining a dream position. If you could place your pieces in an optimal place where would they go, regardless of where your game gold is in.