You may think it is funny, but having one fort that lasted a year may change the whole course of history!
Your fort had 7 dwarves.
Those 2 miners weren't at the capitol.
Now those 2 miners couldn't mine out 50 rocks for the wall at the capitol.
Because of this, the masons had to travel over 20 more spaces in order to get the stone to set up the wall fortifiction.
This caused a 10 minute delay, allowing an assassin in who murdered a guard, before getting imprisoned, all because a fortification wasn't there.
Because the guard wasn't there, a person had to replace him. This person would have made a cheap artifact instead, but due to the military it was delayed.
Because the artifact wasn't there, the foreign buyer didn't waste his money on it, meaning he has 2400 dwarf bucks.
Then a war comes along and because one side had 2400 more dwarf bucks, that means 500 more were in the banks because of the tax on it.
With that five hundred they bought a catapult, hitting the wall down, allowing them to storm the city.
Of course, if ANY of those things had happened differently, it would have turned out to a completely different story, they could have drafted someone else. You could have picked a different civilization. The assassin may have been stopped by a goblin. But no, because of what you did, you just changed history!