The gate kills a third of the troops if the cannon hasn't been built.
Oh well :(, I completely forgot - I went to the Necropolis, collected wood and ore, but didn't go back to the Necropolis itself :(
P.S. If I had known that the cannon wasn't necessary, I wouldn't have gone to the Necropolis, and I wouldn't have wasted time capturing wood and ore.
If I have time and desire, I will replay this part.
